What sleep disorder causes you to sleep over 15 hours a day?

This question was asked in Lincoln, Nebraska on 07/17/2012.
My daughter was born with a genetic disorder called cat-eye syndrome. (Duplication of 22nd Chromo) She has always slept pretty good thru the night but lately she has been very crabby and on edge and sleeping 15 hours at night and taking naps. We have had her checked at her pediatrician and she thinks her health is fine. Is this normal for a child to sleep this much? She is not able to walk with her disorder but crawls a ton so she may be tired from that. Any ideas?

Doctors Answers (3)

J. Douglas Hudson, MD, DABSM
Answered on: 7/23/2012

There are many causes for sleeping 15 or more hours day. Causes range from genetic disorders and brain rumors to medication effect and sleep disordered breathing. You did not give your daughter's age but it sounds as though she has had some periods of normal sleep suggesting that her excessive sleep may be cyclic and return to normal off and on. This could be hormonal in origin. Long sleeping is not necessarily associated with excessive daytime sleepiness which is an important issue. Further evaluation may also include an MRI of the brain. I would recommend seeing a board certified sleep neurologist who is also boarded in sleep medicine.

Syed Nabi, M.D.
Answered on: 7/17/2012

If she is a newborn that maybe normal. As we age, our sleep needs reduce. By adult life most requirement is average 7.5 to 8 hours. If you are suspicious you can consult with a sleep physician for assurance.

Richard J. Schumann Jr., MD
Answered on: 7/17/2012

Not knowing her present age I can't be absolutely certain that this amount of sleep isn't normal. If she is between 2-18 months old this may be near normal if some of the sleep time is from daytime naps. By age 5 naps are usually abandoned and the toddler is sleeping 10-11 hours per day. Having to crawl instead of walk may lead to more energy expenditures and fatigue during the day because of this condition.