The American Academy of Sleep Medicine (AASM) provides some helpful guidelines regarding just how much sleep children need at different stages in their development. Keep in mind that these numbers reflect total sleep hours in a 24-hour period. So if your son or daughter still naps, you'll need to take that into account when you add up his or her typical sleep hours.
Obstructive Sleep Apnea or OSA is a breathing disorder that is more commonly known to affect adults (more than 18 million in the US including Alaska). Sleep Disordered Breathing is also causing problems in 12% of children, according to the American Academy of Otolaryngology. Often running in families it is most commonly seen in kids with enlarged tonsils and/or adenoids, which are the lymph nodes in the throat. Obesity is often a factor as well.