Sleep is Good for you, I guess.

Don't sleep for one day, and you'll get drowsy the next day. Don't sleep the second day, and you'll almost fall asleep after your lunch and collapse after your dinner. Don't sleep for the third day, and you'll sleep for many hours. If you don't wake up after just a nap a mild headache would follow after. Don't sleep the fourth day, and headaches turn to forks that scratch your brain. If you take some pain killers and if you don't sleep for the fifth day then everything starts to change...you can't stay awake anymore...but neither can you fall asleep. You'll sink into this weird world of yourself. It's nothing like being on drugs or alcohol, neither like relaxation nor irritation. It's just you, but so into yourself...you hear stuff, you seem fully aware of them. But you wouldn't have any reflection upon anything external, all actions will stem from your internal decisions. I happened to try it once a long time ago when I had nothing to do, but I've never done it again, not that I would have the free time to do it anyways.