[coldtea]

>In case you feel sleep is a waste of time, it could actually be surprisingly productive to sleep.

Probably the most productive thing one can do.

Idea: Full sleep is useless. I'll sleep 5 hours or less and gain more productive time / life lived.

Reality: Without full sleep (7-8.30 hours/day) you'll be less performant, less intelligent, less healthy, less productive, and on top of the less performance through your life, your life itself will be shorter.