The amount of sleep each person needs depends on many factors, including age, health, recent physical exertion, and mental activity.
Infants sleep about 16 hours a day, while teenagers need about 9 hours on average. For most adults, 7 to 8 hours a night appears to be the best amount of sleep, although some people may need as few as 5 hours or as many as 10 hours of sleep each day.
If someone does not sleep enough, it could lead to sleep deprivation that has serious effects both on the body and mind.
