Even if you don't have any sleep problems or medical issues, the quality and quantity of sleep can play an important role in how well you function during the day. This study showed that in normal, healthy children, shorter sleep duration was associated with lower IQ scores and perceptual reasoning.
In this age of information and programming overload, children in general have very poor sleep habits. In many cases, parents' poor sleep habits set a bad example. The implications of this study also apply to grownups as well.
How long do your children sleep? Do they have a regular routine before going to bed, or is it a struggle every night?