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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.
By Marilyn Elias, USA TODAY. The truism that all adults need at least eight hours of sleep a night for good health should be put to rest by mounting evidence that less may be better, a leading sleep scientist says.fter accounting for all of these factors, adults getting an average of seven hours had the lowest death rates. Surprisingly, less sleep, even as little as four hours a night, didn't significantly increase deaths for men and only lowered survival for women if they averaged less than four hours.