Sleep is a naturally recurring state of mind and body characterized by altered consciousness, ...... The study allowed 18 women and 22 men to sleep only 26 minutes per night over a four-day period. Subjects were given initial cognitive tests .Biphasic sleep is the practice of sleeping during two periods over 24 hours, while polyphasic .... In his 1992 study, "In short photoperiods, human sleep is biphasic", Thomas Wehr had eight healthy men confined to a room for fourteen hours of .
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