Here’s an interesting article from 2004 showing how sperm counts in men living in Western industrialized countries are rapidly declining. In 1950, the average sperm count was 100 million sperm pr mL. in 1970, 75 million and in 1990, 50 million. Anything under 20 million is considered infertile.
We know that untreated obstructive sleep apnea can suppress reproductive hormones. External artificial hormones such as the xenoestrogens that mimic estrogen can also aggravated this problem. I’ve written extensively in the past about fertility issues in women in the past and how undiagnosed sleep-breathing problems can be a major aggravating factor. No wonder there are so many couples having trouble conceiving.