Title: Human sleep less, better than other animals.
Humans need less sleep than other mammals, but their slumber is more efficient, said researchers at duke university in noth carolina.
In their study, the scientists researched sleep patterns of hundreds of animals. They discovered humans sleep for shorter periods of time compared to other animals.
The study also concluded that a human’s sleep is higher quality. a deeper stage of sleep, called rapid eye movement sleep or REM, make up 25 percent of human’s sleep. In primmates like lemurs or monkeys, REM sleep does not the reach 5 percent mark.
Humans are unique in having shoter, higher sleep, said david samson, the study co-author.
Samson’s research team found people can prosper with an average of 7 hours of sleep a day. other primates need as many as 14 to 17 hours sleep.
Samson said, human sleep habits evolved during the prehistoric times.
原文：http://www.cnblogs.com/zhulinmails/p/5054287.html