UARS Article In Forbes.com
August 6, 2011
Here’s a good summary of upper airway resistance syndrome (UARS) in the Forbes.com health blog, where I get interviewed about this all-too-common condition.
Fatigue And Multiple Sclerosis, Along With UARS
July 2, 2011
There are probably a thousand different reasons for someone to be tired. Many people with neurologic conditions tend to report being overly tired. Not too surprisingly, fatigue was found to be reported as the first symptom with multiple sclerosis (MS), long before the first signs of MS show up. We know that MS is an autoimmune condition, where various parts of the brain are affected, leading to a number of different symptoms. But one thing I’ve noticed is that almost every person with MS also seems to have the upper airway anatomy of someone with upper airway resistance syndrome (UARS).
Women are more likely to suffer from both UARS and MS. They typically are thin, and won’t snore. Both groups in general tend to avoid back sleeping, and have narrow jaws with high arched hard palate. Women with (UARS) are more likely to have autoimmune conditions. Many will also have cold hands and feet, and have at least one parent that snores heavily. Whenever I look at their airways with an endoscope, the space just behind the tongue is usually only a few millimeters, especially when lying flat on their back.
My suspicions must be proven with prospective studies, but the similarities are pretty striking. Since we know that sleep-breathing problems can cause major structural and biochemical damage to the brain, I wouldn’t be surprised if someone proves that these two conditions are strongly connected. Just to be clear, I’m not talking about obstructive sleep apnea. Rather, people with UARS are unable to attain deep quality sleep due to frequent microobstructions and arousals, without frank apneas or hypopneas.
If anyone reading this has MS, do you have cold hands or feet? Can you sleep on your back at all? Do your parents snore heavily?
Kindle Version of Sleep, Interrupted Price Cut 50%
January 12, 2011
In the interest of getting my important message about breathing and sleep out to as many people as possible, I’ve worked out a deal with my publisher to lower the price of the electronic version of my book, Sleep, Interrupted from $19.99 to $9.99, which is a 50% drop. Click here to order from Amazon.
Here’s the latest Amazon review about my Kindle e-book (reviews for the hardcopy version are found here):
One of the Most Influential Health Titles I Have Ever Read, December 11, 2010
Reading this book showed me how to take a huge step forward in my overall health.
I feel tired all the time. Worn out. I don’t want to live this way and have been investigating all possibilities about its cause. Fatigue and sleep are obviously related, and I researched many sources trying to learn to improve my rest. I found Dr. Park’s internet postings, and became very intrigued by his approach to diagnosing sleep problems, and the number of different solutions he could recommend. I pursued more of his writing on the net, and came across this Kindle book.
I categorically recommend that everyone, everyone, read this book. Kindle books are often impulse purchases, and yeah, maybe the price of this book is higher than most Kindle Books. But I’m absolutely positive that the information in this book will help you (or someone who will listen to you!) in an invaluable way. Get it, read it. It’s like a “CPR course” for sleeping. Someday you will really help someone with what you know.
This book shows that, although we only have one word for “sleep”, sleep itself is a vast array of different of mental and physical processes. All these processes must work together in order for me to wake up feeling good. If one of these processes malfunctions, symptoms show up, not only as short term fatigue, but also in many other long term, seemingly unrelated, aches and pains.
“Sleep Interrupted” describes entire chain of sleep processes, and how sleep malfunctions show up. Dr. Park writes with great clarity and detail, and describes therapies specific to my problems. These aren’t “warm milk” remedies. I sought a doctor’s care to move forward. But even before I found the right doctor, learning what might be happening to me was a huge boost to my mood. I understood that I might have reasonable, measurable problems which can be fixed. I wasn’t defective in some way, and doomed to eternal fatigue. Doctors’ examinations since I finished the book have confirmed that I suffer from many of the phenomena Dr. Park describes. I’m very grateful for having found, and for being willing to spend the money to buy this book.
Click here to order the Kindle version of Sleep, Interrupted now.
Expert Interview: Dr. Richard Quinttus on Oral Systemic Balance
October 18, 2010
Please join me for this month’s Expert Interview as I invite Dr. Richard Quinttus to speak to us about Oral Systemic Biology (OSB) therapy. There are a number of different dental/orthodontic techniques to not only align our teeth, but also to improve our breathing passageways by widening our upper and lower jaws. After hearing about OSB, it sounded almost too good to be true.
In this teleseminar, Dr. Quinttus reveals:
- How poor breathing due to narrowed upper airway breathing can lead to or aggravate anxiety, fatigue, muscle aches, headaches, snoring, sleep apnea, forward head posture, and constant throat clearing.
- How to optimize breathing by allowing the relationship between the tongue, jaw, throat and spone to balance.
- How this device aids the tongue in moving forward
- How you can find an Oral Systemic Balance practitioner near you
- And much, much more…
Please enter your information below to receive your mp3 download information via email:
UARS: The Hidden Sleep Condition
August 21, 2010
You’ve gained some weight over the years and you’re just not sleeping well. Your husband says you’ve begun snoring. You know that your father has obstructive sleep apnea and is doing well with CPAP. You mention this to your doctor and she orders a sleep study. The sleep study comes back completely normal. Now what?
The Real Reason for Your Chronic Fatigue
Before you begin searching for other reasons for your chronic fatigue, don’t rule out a sleep-breathing problem too quickly, even if you don’t have obstructive sleep apnea. In fact, a sleep-breathing problem can cause if not aggravate conditions such as hypothyroidism, chronic fatigue syndrome, depression, insomnia, and even irritable bowel syndrome.
Sleep doctors have defined obstructive sleep apnea as having at least 5 apneas or hypopneas every hour on average. An apnea means you stop breathing completely for 10 seconds or longer. Hypopneas are similar 10 second or longer pauses but with restricted airflow. But what what happens if you stop breathing 25 times every hour but each episode lasts only a few seconds?
In the early 1990s, Dr. Christian Guilleminault of Stanford University looked at young, thin men and women who were tired all the time, no matter how long they slept. These people were found not to have obstructive sleep apnea after undergoing formal sleep studies. However when they placed thin pressure catheters in their chest and throat, they found the they had frequent episodes of partial obstruction which led to subtle, but significant limitation of nasal airflow, along with very negative vacuum pressures in the throat. Most of these minor episodes were not apneas or hypopneas, but still lead to an arousal—from deep to light sleep. What was happening was multiple partial obstructions and arousals that were not severe enough to be called apneas or hypopneas, but enough to wreak havoc on deep sleep quality.
It’s been shown that even very subtle levels of restricted breathing can lead to deep brain stimulation and arousals that prevents your ability to stay in deep sleep. These reflex signals to the brain can be so weak that it doesn’t even reach the outer layers of the brain where standard scalp electrodes can pick up these disturbances.
Blame It On Your Parents (And Your Jaws)
The fundamental problem in UARS is due to smaller upper airway anatomy, caused by having smaller jaws and dental crowding. The smaller the space behind the tongue, the more likely you’ll obstruct while breathing when on your back (due to gravity, the tongue can fall back), and when in deeper levels of sleep (when your muscles relax). This is why most people with UARS can’t, or prefer not to sleep on their backs. The problem is that you can still have breathing problems despite sleeping on your side or stomach, just not as bad as being on your back.
Lack of sleep and especially lack of deep sleep has been found to cause a whole host of physiologic changes. In general this happens due to chronic overstimulation of your sympathetic nervous system. This is the fight-or-flight half of your involuntary nervous system. Since your body thinks it’s under attack, it heightens your nervous system, making you en garde, edgy, hypersensitive or overreact to normal situations. This also leads to diversion of blood flow, energy and resources away from less essential body parts and organs, such as your digestive system, reproductive organs, skin, hands, feet, and other “end organs.”
Due to this “hypersensitivity,” the nose and sinuses can be overly sensitive, reacting to stimulants such as weather changes, chemicals, scents, and even allergies. Chronic stress that results from sleep deprivation also can heighten your immune system.
Is It Hormones or Your Breathing?
A number of other studies point out that UARS patients are more prone to have cold hands or feet, hypothyroidism, irritable bowel syndrome, depression, chronic fatigue, and various other “somatic” syndromes. I see this all the time in my practice. In fact, a recent study even showed that chronic long-term sleep deprivation caused significant lowering of the TSH and T4 levels, with women being much more susceptible to this effect compared with men.
With time, as people age, and especially as they gain weight, most people will progress into true obstructive sleep apnea. You’ll find that most younger, thinner people with UARS will have one or two parents with significant obstructive sleep apnea.
Now that you’re convinced that you may have this condition, what can you do about it? For the most part, it’s treated just like obstructive sleep apnea. You should start with all the conservative options first, such as weight loss (if you’re overweight), diet, exercise, improving your nasal breathing, and not eating late. If these options don’t work, then all the formal options for treating obstructive sleep apnea are possible including CPAP, oral appliances, and even surgery.
Unfortunately, if you don’t officially have a sleep apnea diagnosis based on a sleep study, then insurances generally won’t cover any of the treatments. The irony is that our health care system won’t treat or prevent diseases in the early stages, and would rather wait until it’s much more severe before covering for medical services.
If you think you may have upper airway resistance syndrome, you may be disappointed to find that the medical community in general will not be responsive to your queries. With a few exceptions, many sleep doctors are not convinced that UARS is even a legitimate condition, and would rather lump it into the spectrum of snoring to obstructive sleep apnea. Time after time, whenever I see patients who are told they don’t have obstructive sleep apnea and I treat the upper airway narrowing and inflammation, patients almost always feel better. Your best option is to continue to educate yourself and be persistent. Your first priority should be to be able to breathe better so that you can sleep better.
An Uncomfortable Situation Regarding Sleep Apnea
December 15, 2009
One of the biggest dilemmas in my personal life is how to deal with friends or family members that I’m sure have obstructive sleep apnea or upper airway resistance syndrome. Should I even mention this condition at all, outside of a professional relationship? Is it even ethical, not to mention practical, to give medical advice to close friends or family members?
Once your eyes are opened to how common sleep apnea is, you’ll see that almost every other one of your friends or family will have varying degrees of sleep apnea. Many more won’t have sleep apnea, but a lesser variation called upper airway resistance syndrome. As you get older, I guarantee that a significant number of your friends will have it. Sadly, only 10% of sleep apnea is ever diagnosed and treated by doctors, who instead tend to treat the complications of sleep apnea such as high blood pressure, depression, anxiety, heart disease, heart attack and stroke.
Ultimately, I’ve decided to take these situations on a case by case basis. Invariably, we’ll get on the discussion of what I do at work, and the topic of sleep apnea comes up. Depending on how interested he or she seems, I’ll gently suggest getting evaluated for it. I’ve had various responses to this approach. A number of my close friends have their lives changed radically after being diagnosed and treated for severe obstructive sleep apnea. Others who I know have severe sleep apnea either don’t take it too seriously, and continue their lives thinking that their fatigue, high blood pressure, and weight gain is just a normal part of getting older. In many cases, spouses of these people are frustrated because he or she won’t listen and go see a sleep specialist about this problem.
The other day, I ran into the wife of a couple that I know in my apartment complex. She relayed that her husband is sleeping much better since getting his CPAP machine and wanted to thank me for my advice. A few months before, the topic of her husband’s severe snoring came up during a conversation about what I did for a living.
As long as I can make a difference in my personal, as well as my professional life, I’m still going to do everything that I can to make people aware that sleep-breathing problems are a major cause of illness, fatigue, disability, and even death.
Have you reached out to your friends or family about sleep apnea? What was their response? Please respond with your comments below.
Tonsils, Mono, and Chronic Fatigue
December 2, 2009
As I was taking out enormous tonsils from a young child yesterday, I was reminded of a young female college student that I treated many years ago who came to see me with severe tonsillitis. She had severe throat pain, difficulty swallowing, diffuse and tender swollen neck glands, and couldn’t sleep at all. Due to the severity of her "infection," I prescribed a course of oral antibiotics, as well as a short course of anti-inflammatory steroids, to get rid of the swelling in her throat. The next day, she reported that she was feeling dramatically better and sleeping better as well. When I saw her three days later, her tonsils were not touching in the midline anymore, and her neck glands were much smaller. Upon further questioning, she did state that she’s always had large tonsils, but they became much bigger with this infection.
You may think that the antibiotics helped to fight the infection, but typically, it takes 2-3 days for antibiotics to reach significant concentrations to begin to work. What actually helped her feel better, faster, was the steroids, which begins to work within a few hours.
In retrospect, she probably had mono. But because it resolved rather quickly, it would be classified as a routine throat infection that resolved with antibiotics. However, since mononucleosis is a viral infection (the Epstein-Barr virus), antibiotics won’t really make a difference. Had she not been given oral steroids, her symptoms probably would have continued for weeks to months, despite being given multiple rounds of antibiotics. Most of these patients eventually start to feel better after some time, but some never feel better. This is the classic mono condition that you hear about. Some are later diagnosed with chronic fatigue syndrome.
The reason for these persistent symptoms is that the Epstein-Barr virus preferentially infects the lymphoid tissues in your body. Since your tonsils are lymphoid tissues, they will swell up. Having larger tonsils all of a sudden will narrow your upper airway, causing frequent obstructions and arousals when in deep sleep due to muscle relaxation.
Frequent obstructions also causes stomach juices to be suctioned into the throat, which causes more swelling and inflammation of the tonsils, leading to a vicious cycle.
You may be thinking that it’s a good idea to take out your large tonsils, since it’ll prevent this situation from happening the next time you get a cold. For the most part, it should help, but don’t think of it as a cure. Studies performed in children who undergo tonsillectomies showed that only about 2/3 improve significantly. Many of these non-responders will go on to have obstructive sleep apnea later in life. Even the "responders" will have a slightly increased risk of obstructive sleep apnea, since their jaw structures are more narrowed, which lead to enlarged tonsils.
Do you have large tonsils and have severe or recurrent throat problems every time you get a cold? If so, please enter your experiences below in the comments box.
What Everyone Should Know About Tonsillectomy
September 16, 2009
Tonsils are one of the most misunderstood structures in the throat, not only by patients, but by many doctors as well. Traditional teaching states that tonsils are glands in the throat that help to fight infection. Because they are blamed for most cases of repeated throat infections, tonsillectomy is one of the most commonly performed operations in the United States. As I’ll reveal in the remainder of this article, many tonsillectomies today are being performed unnecessarily. Simultaneously, there are too many tonsils still left in place when in fact they should be removed. Here’s the reason why.
What Are Tonsils?
Before I can clear up the contradictory statement above, I must first explain what tonsils are and what they do to merit removal, if at all.
Tonsils are lymphoid tissue, like glands in your neck, armpits or groins. They are part of the immune system and are involved in learning what’s foreign and helping to make antibodies to help fight off infections. In young children, lymphoid tissues are very sensitive and can become greatly enlarged even after a simple cold or infection. If you have young children, I’m sure you’re familiar with their complaints of sore throats whenever they have colds.
It’s also important to note, however, that tonsils can swell up not only after viral or bacterial infections, but also from allergies and acid reflux. Any degree of irritation or inflammation can cause the tissues to swell up. This is normal, and will happen to various degrees in people after any type of infection, irritation or inflammation. As such, not all complaints of a sore throat are viral or bacterial in origin. There are many factors for an enflamed tonsil—this is the reason why antibiotics are not as effective in curing sore throats.
What Do Tonsils Do?
Tonsils are part of Waldeyer’s ring, which is a complete circle of lymphoid tissue that is made up of both tonsils in the side walls of your throat, the adenoids, which are in the midline back of your nose, and your lingual tonsil, which is located at the base of your tongue in the midline. In some cases, you’ll see small connections between all four glands, forming a complete circle. Anything that you breathe in or swallow has to go through this “ring”, so that the body can learn what’s coming into the body. This process is most active around ages 3 to 6.
It’s common knowledge what happens when your tonsils become infected: your throat hurts, you have a fever, your neck glands hurt (lymphoid glands that drain your tonsils), and you don’t sleep well. Anything from simple cold viruses to bacteria, and even allergies can cause your tonsils to swell. Streptococcal bacteria are very common, but there’s one particular strain called Group A beta-Hemolytic Streptococcus (GABHS) that tested for and treated, since toxins produced by this strain can potentially damage the heart or the kidneys. In theory, non-GABHS bacteria can also give you similar miserable symptoms, but if severe, doctors will typically give you oral antibiotics, which will make you feel better in most cases.
When Tonsils Mean More Than Sore Throats
But there’s one more variable that occurs during a tonsil infection that’s usually not appreciated—the fact that the tonsil can swell significantly. As I’ve mentioned in my book, Sleep, Interrupted, and in other related articles, humans have relatively narrowed upper airway breathing passageways to begin with, and even mild inflammation and swelling in the throat can narrow this airway even further, almost always leading to various degrees of obstruction and arousal from sleep.
What this means is that, your enlarged tonsils not only affect how sore your throat feels, they can also cause you to sleep poorly. Here’s the reason why.
If the inflammation and swelling caused by an infected tonsil causes your airway to narrow or obstruct entirely and this in turn, causes you to stop breathing, you’ll either wake up to light sleep immediately, or stop breathing for 10 seconds or longer and then wake up. In this latter situation, you would have experienced what’s called an “apnea” or “loss of breath." Most people will have lots of short obstructions and arousals—this is why if you have a simple cold, you won’t sleep as well, since you’ll toss and turn more often than normal. Luckily, in most situations, once the infection goes away, you’ll return to normal.
However, there’s one more piece to the puzzle that can prevent you from feeling better: This is the piece that many patients and even many doctors overlook as well. If you stop breathing, even temporarily, you’ll create a vacuum effect in your throat, where your stomach juices literally get suctioned up into your throat. Small amounts of acid, bile, digestive enzymes, and bacteria can cause your tonsils to stay swollen, aggravating this vicious process. Even worse, your stomach juices can then travel up into your nose or down into your lungs, wreaking more havoc. Add to this a stuffy nose, then another vacuum effect is created downstream, and the tongue can fall back even further.
Certain viruses such as the Epstein-Barr virus (that causes mononucleosis) attack lymphoid tissues specifically, and as a result, keeps the tonsils abnormally large.
This is one reason why patients with this condition have prolonged bouts of chronic fatigue.
Misleading Throat Pain
Most people (and doctors) naturally assume that if your throat hurts, it means that you have a throat infection. If the antibiotics that you’re given works, then it means that it was an infection after all, right? Not necessarily. One of the most commonly prescribed oral antibiotics is called azithromycin (brand name is Z-Pak), which is a convenient 5 day course. One of the lesser known beneficial side effects from this medications is that it empties your stomach faster. So by keeping your stomach juices from coming up, your throat will feel better relatively quickly, sometimes working faster than what you’d expect from typical antibiotics. The problem with this medication is that it only works sometimes in some people, and the effect begins to wear off after a few doses.
Notice how for many people, cold and sinus “infections” always start in the throat, with a tickling, sore throat, mucous accumulation, hoarseness, cough and post-nasal drip, all of which are symptoms of throat acid reflux. Then as swelling in the throat worsens, more and more juices are brought up into the throat, causing more swelling. If you have larger than normal tonsils, then the narrowing in your throat will be more severe and you’ll stop breathing more and more often. If this process continues, the end result will be the classic bronchitis or sinusitis.
Normally, tonsils shrink down to very small glands by the time you’re an adult, but for some people, they stay enlarged. One possible explanation is that they are subjected to repeated bouts of inflammation from stomach juices, and the large tonsils can bring up more stomach juices.
A Rite of Passage?
In the 50s to 70s, it was a given that if you had tonsils, they were removed. The number of tonsillectomies has dropped significantly since then, but more recently, it’s climbing back up. The main reason for tonsillectomy back then was for recurrent infections, but now obstructed breathing is the most common indication.
We now know that even mild degrees of sleep-breathing problems in children can cause a wide range of problems, from bed-wetting and ADHD to behavioral issues and asthma.
A recent study published in the journal Pediatrics showed that about 50% of children with ADHD could be cured with adenotonsillectomy (this is when you remove both the adenoids and tonsils). Countless studies report significant improvement in children’s cognitive, behavioral, memory and sustained attention scores, after tonsillectomy. Even my son Jonas had dramatic improvements after his tonsillectomy.
Not all children with ADHD have a sleep-breathing disorder, but since it’s such a common condition that can be treated, it’s worthwhile to at least consider it if your child has ADHD. People are always asking why a stimulant medication such as Ritalin helps children focus and remain calmer. The answer is that they’re sleepy.
Poor quality of sleep can also heighten a child’s senses and cause abnormalities in their involuntary nervous system, making him or her have balance problems or become hypersensitive to certain sensory forms of input, such as touch, sounds or odors.
The Truth About Tonsillectomy
Unfortunately, not all children who undergo tonsillectomy improve. A recent meta-analysis combining multiple tonsillectomy studies showed that overall, about 2/3 had significant benefit. Some children do somewhat well, but not as well as some others. The explanation here is that the tonsils are not the only part of the equation. By definition, if your tonsils are large, then your jaws will be smaller. I’ve mentioned in my book, Sleep, Interrupted that modern humans have smaller jaws than our ancestors even a few hundred years back, mainly due to a change in our diets (from organic foods off the land or oceans to processed foods with refined sugars). Bottle-feeding is another modern Western phenomenon that has been shown to aggravate this process. If you have smaller jaws to begin with, you’ll have more inflammation in your throat via the mechanism that I described earlier, which will predispose your tonsils to become enlarged. Having large tonsils will cause more obstructions, causing a vacuum effect, which can also narrow your jaws, especially since a young child’s jaws are relatively soft and malleable.
A recent study showed that compared with tonsillectomy alone, orthodontic palatal expansion was equally effective. When both procedures were performed, the results were additive. This study goes to show that dental and orthodontic issues may be important considerations long before parents consider braces for their teens.
Outgrowing Your Tonsils
Some of you may be asking, if the tonsils are an important part of the immune system, why take them out? Most of the early education of your immune system occurs before age 6. Either during this time, or even long afterwards, if your tonsils are so large that they literally obstruct your breathing at night, then wouldn’t you think that this is a more important issue that needs to be dealt with? Doctors will also say that children will “grow out of it.” Yes, in most cases, they will, but based on all the recent studies, there’s plenty of evidence that before they “grow out of it,” there can be potential long-term consequences, including your risk for developing obstructive sleep apnea, heart disease, heart attack and stroke later in life.
I once heard a presentation at a national sleep meeting, where they showed children who underwent tonsillectomies all improved dramatically. The disturbing finding from this study was the fact that compared with children who did not have sleep-breathing issues, the children who underwent tonsillectomies never fully caught up to the control children in terms of cognitive and behavioral measures. What this implies is that there’s some degree of permanent brain damage. Fortunately, children’s brains are highly adaptable, and can compensate very well.
By no means am I advocating routine tonsillectomies for all children. But if your child has any of the issues that I talked about in this article, or if you’re on the fence about whether or not your child should undergo some type of treatment, these issues are definitely worth thinking about.
From Fatigued to Fabulous! A Special Interview with Dr. Jacob Teitelbaum
September 13, 2009
Please join me on Tuesday, September 15th at 8PM Eastern when I’ll interview Dr. Jacob Teitelbaum, one of the world’s leading experts on chronic fatigue and fibromyalgia.
Dr. Teitelbaum is the author of the best-selling book, From Fatigued to Fantastic!, and has appeared on Good Morning America, CNN and Fox News Channel and is a frequent guest on Oprah & Friends with Dr. Mehmet Oz.
You Will Learn:
=> What chronic fatigue syndrome and fibromyalgia are
and why sleep is essential for treating them.
=> The pros and cons of different treatments.
=> What some of the symptoms of chronic fatigue syndrome
fibromyalgia are.
=> The role of sleep apnea in chronic fatigue syndrome and fibromyalgia
Register here to receive the call-in details. Be one of the first 200 to register and you’ll get an mp3 recording of this interview for free.
Rare Short Sleep Gene Discovered – With A Catch
August 14, 2009
Researchers discovered a rare gene mutation that allows people to function on less sleep. A mother and daughter normally can sleep for about 6 hours whereas others have to sleep 8 or more hours. When this gene was placed in mice, they also had less need for sleep. Study co-author, Dr. Fu, commented that her "fantasy" is that this finding could lead to treatments that can lead getting by on less sleep. This finding was published in today’s issue of Science.
When scientists bred mice with the same mutation, they also needed less sleep and were able to recover quicker from less sleep. However, a similar study last year showed that fruit flies with a similar gene mutation produced similar findings, but died 40% faster.
We know from multiple studies that people who sleep too little have a much higher chance of developing depression, diabetes and heart disease. People who sleep too long have similar risks, but not as severe.
Different people have different sleep duration needs. The 8 hours that’s generally recommended is a myth. This is assuming that everyone is able to breathe normally at night. But most modern humans are susceptible to breathing problems at night due to our smaller jaw structures and dental crowding. This is why many people can’t sleep on their backs. They keep waking up due to various degrees of obstruction and arousal, since the tongue relaxes in deep sleep. The extreme end of this continuum is obstructive sleep apnea. This is a major under-appreciated condition that can explain chronic fatigue, weight gain and unrefreshing sleep.

