Sleep

[gubi-gubi]

Also they made an interesting claim that people could learn themselfs to only need 2 to 4 hours of sleep a night. It seems we go through ceveral cycles in our sleep. You have the first fase (don't remember name), then follows the well known REM fase and when that ends the whole cycle starts over again. Normal people have about 4/5 cycles a night but if you can train yourself to wake up exactly after the first cycle has finshed you should feel as rested as when you had a full nights sleep. Also you when you feel really tired after a full nights sleep there's a good chance you got woken up while in the REM fase. Interesting stuff.

Thats what they train the SAS and spys with so they can get quick sleep in dangerous situations.