I disagree with that study. Myself and a colleague used to go for days on what were called "micro naps". After a certain amount of practice you can train your m

I disagree with that study. Myself and a colleague used to go for days on what were called "micro naps". After a certain amount of practice you can train your mind to hit REM within the first few seconds of shutting your eyes for sleep. Over time it really messes with your head. You become very irritable. Lookup "Peter Tripp, radio DJ". A very famous story with a very sad ending. Long-term sleep deprivation is very bad for you. I know, I've tried it.