Sleeping less is not good for health,but as a university students,we couldn't avoid from sleeping late at night,and sleeping for 3 to 5 hours at night have been our routine of life in university.When it become our routine,we might have problem in sleeping for instance insomnia.This disease also happen to older people,some of them can't sleep because of the pain they have to get through as an old people.Research had been done by scientist that the maximal sleep capacity of both young and older persons, arranged for groups of younger adults (ages 18 to 32 years) and older adults (ages 60 to 76 years) to lie in bed for 12 hours during the night and for another 4 hours in the afternoon.The normal sleep pattern are 7 to 9 hours daily.Make sure that you are following the kinds of routines and behaviors that will give you the best chance of getting as much refreshing sleep as possible. Here are some examples of good sleep hygiene.Make sure that you're going to bed early enough to allow yourself to get an adequate night's sleep.
As your bedtime approaches, develop a relaxing routine in the evening — don't keep busy until the moment before you expect to fall asleep.
Avoid watching TV in bed.
Sleep in a cool, relatively dark room.
Consider going to sleep to the sound of white noise, either from a bedside fan or a machine that generates calming sounds.
Increase your exercising, but don't do it so near to bedtime that it gets your adrenaline flowing and keeps you awake.
Limit your daily intake of caffeinated beverages and avoid them completely after lunchtime.
So,we should have enough good sleep,especially as a student,we have to learn lots of things in class.It is good to have enough sleep at night so that we have the energy to learn.
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