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atleast 8 hrs
A teenager needs 8 1/2 to 9 hours sleep a night to be able to function at their peak so they should go to sleep at a time that allows them to get that much sleep.
It should take about half an hour
the recommended time is about 8 hours. It's better to get more though.
It depends on which aspect of sleep you are talking about, but in general, not much time is spent studying sleep while in medical school (probably on the order of a few days). But depending on which type of residency the doctor trains in, there may be a lot of time devoted to it. For instance, those studying to become neurologists will spend much more time learning about sleep than those becoming surgeons. Some doctors even specialize in sleep medicine or sleep disorders, and they can spend years in post graduate training to learn about sleep.
midnight
They should sleep at 9:35pm.
Reptiles (like most animals) sleep when THEY need to - there is no set time. In the wild, they'd eat then rest in short bursts.
For 9-12 years old, about 8 or so hours of sleep, but that's all i know.
you should go to sleep at 9:00 because 10 is too late and 8 is too early.
A 11 year child should sleep at 9 A.M.
Newborns spend more time sleeping than awake so they really don't take "naps" they just sleep a lot. You should let your baby sleep as much as he or she wants to.