Depending on where you look the golden rule for longevity seems to be 6-7 hours of sleep. The interesting thing about 7 being the more common number is that 7 d

Depending on where you look the golden rule for longevity seems to be 6-7 hours of sleep. The interesting thing about 7 being the more common number is that 7 doesn't fit into the commonly held belief that sleeping in sync with 90 minute REM cycles is more healthy/effective. Example of study saying 6-7 hours: http://www.worldhealth.net/news/six_to_seven_hours_sleep_best_for_a_long/ http://www.worldhealth.net/news/six_to_seven_hours_sleep_bes...