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Sleep I find very interesting. While I was in the Army, sleep deprivation was a form of breaking us down. Waking up at 3-4 in the morning was normal, bed time was usually around 10. During watch, I'd be lucky to sleep 4 hours. On sleep cycles: http://www.collective-evolution.com/2013/07/13/alternative-s.../ To add, I really think that as long as you get into a rhythm of sleep cycles your body and mind should be okay. If anyone knows any more about sleep feel free to chime in.