Different sleep cycl: some people do well with just 4 to 5 hours a day but maybe just a short nap midday. Others need 10 or more hours to feel rested and have a clear mind. There are so many variants to a normal sleep cycle. You may have a shorter sleep cycle. If you feel you have decent focus and concentration along with decent strength or stamina, then you are probably getting enough sleep.
Answered 1/30/2016
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