Dennis Rosen M.D.

Sleeping Angels

“… But My Niece Sleeps 12 Hours Every Night!”

Why everyone else’s kid sleeps better than yours

Posted Nov 15, 2013

I meet a fair number of parents whose kids don’t fall asleep as fast, or stay asleep as long as they’d like.  There can be many reasons for this, but a surprisingly common one is that the parents expect their child to sleep longer than he or she is able to.

If your 3-year-old is getting a two-and-a-half hour nap at daycare, it’s not reasonable to expect that he’ll fall asleep at 7 PM and stay asleep until 7 AM.  Most 3 year olds need about 11 hours of sleep in total during a 24-hour period, and if they’re getting a lot of daytime sleep, it’s going to come at the expense of nighttime sleep.

As I explain to parents, if someone were to lock them into a bedroom for 16 hours, they might sleep 8, 9, or even 10 hours (if they were really sleep deprived, which many are!), but at some point, they’d wake up and start looking for something else to do: read a book, watch TV, etc. The need for sleep is, after all, driven by the brain, and it is very difficult if not impossible to simply will yourself to sleep when that need simply isn’t there.

Many parents have trouble reconciling this with what they hear from other parents, who report that their child get a solid 12 hours of sleep at night even after taking a two-hour nap in the afternoon. Why can’t my child sleep like theirs? they ask.

new study published this week comparing data collected by motion sensors worn by children ages 4-6 with what their parents reported about their sleep found that there were significant discrepancies between how long the parents believed their children were sleeping and how long they actually were sleeping, with the parents overestimating just how much sleep their children were getting. They also found that the parents underestimated how long it took their children to fall asleep, and the number of night-time awakenings.

The conclusion: just because your niece is in bed a lot longer than your child doesn’t necessarily mean she’s sleeping for longer.


Dennis Rosen, M.D.

Help your child get a great night's sleep with: 

Successful Sleep Strategies for Kids (a Harvard Medical School Guide)