how many hours sleep required for a healthy person
1 Teenagers need about 8.5-9.5 hours on average. 2  Most adults need 7 to 9 hours a night for the best amount of sleep, although some people may need as few as 6 hours or as many as 10 hours of sleep each day. 3  Women in the first 3 months of pregnancy often need several more hours of sleep than usual.