What is the least amount of sleep a human can go without and still function normaly?

Question

Must be done on a daily basis without caffine intake.

Answer 1

I personally need tons of sleep. I have heard Jay Leno say many times that all the sleep he needs is 4 hours a night. He said that he's only slept for about 4 hours a night most of his adult life. I can't imagine it. But, that's the least amount of sleep that I've heard of someone getting and leading a normal life.

Answer 2

After being awake for 24 hours the ody reacts as if it were legally drunk. Judgement is impaired, body is harder to control.

Answer 3

I'd say about 8 hours...