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Message: <blockquote data-quote="TheFinalEpic" data-source="post: 338074" data-attributes="member: 7073">From what I've read and researched, sleep works in cycles of 90ish minutes.  When you wake up in the middle of one of those cycles, you will be groggy, tired, and will likely want to sleep more.  When waking up at the end of these cycles, you will feel refreshed, and will not need to sleep anymore, even if it was only for 3 hours.  Now, one thing that I really want to try in 2018 are the polyphasic sleeping schedules, the everyman sleep schedule looks like it could be interesting.  Sleeping 4.5 hours at night, with a nap or two during the day could allow for huge productivity spikes.  Anything that is mainstream knowledge (ie. 8 hours minimum) seems to be less than healthy.  Something that is so personalized like diet, sleep, exercise, or what have you shouldn't be generalized advice.</blockquote>