You need at least eight hours of sleep more and more is recommended. Although some people might say that sleep is just a waste of time. But no you need sleep to survive you can’t go a week without sleep otherwise, your dead. There are three cycles of sleep light sleep deep sleep and R.E.M. sleep (rapid eye movement). Sometimes how much you sleep matters with your age other times your health.
A toddler should get about 11 to 18 hours of sleep. a child should get 8 to 12 hours. For seniors they don’t sleep a lot and get about 5 to 9 hours of sleep. And not only do healthy sleepers differ from each other in how much sleep they need, but healthy sleepers also change their sleep needs over time. More sleep is always good but not to much.