[djbass]

What 1X said.

I do believe that sleep is quite essential, but some people have the ability to endure without sleep. I assume they must have some other mechanism going in their body that regulates the things that would normally only happen in a resting person. He surely though must require occasional periods of rest even if only sitting down for a few hours, it'd be a lot of stress on the body otherwise.

Personally I've only ever gone 2 days without sleep before I literally passed out for 24 hours.