How many hours of sleep should an 18 year old be getting?

The amount of sleep you need depends on many factors, especially your age. Newborns sleep between 16 and 18 hours a day and preschool children should sleep between 10 and 12 hours. Older children and teens need at least nine hours to be well rested. For most adults, seven to eight hours a night appears to the best amount of sleep. However, for some people, "enough sleep" may be as few as five hours or as many as 10 hours of sleep.