[pajju]

Sleep well for 8hrs. You really need good sleep. All this hacks looks great but have a long term effect on health for sure.

[tobylane]

Many animals have all sorts of odd sleeps, sharks most of all. There's been no real research into it, but it's something like REM sleep matters the most, and in polyphasic sleep you get to REM really quickly. Maybe 1.5-2h of an 8 hour sleep is REM, but 15 of 20 mins is REM, if you are used to 20 mins.