One possible version:
It's important for students to have enough sleeping time. However ,many of them don’ t have enough time to sleep.
There are different reasons for it.Some students often spend too much time on computer games so that they don’t go to bed early.Some students have bad sleeping habits.They often drink too much tea or coffee before going to bed.This makes them too excited to fall asleep ..
In order to get enough sleep ,we should keep away from computer games.We shouldn’t stay up too late . What’s more ,we can drink hot milk instead of coffee or listen to soft music before we go to bed ,which can help us have a sound sleep.
In a word , if we make good use of time and form good habits , we’ll have enough sleeping time . Then we’ll be happier and healthier