Actually, humans don't need to sleep. If you practice, you can survive without sleep. I learned of the secret technique when sleeping.
The theory is sound; If you accumlate enough sleep, you don't need more sleep. The typical novice approaches this by sleeping in preparation for not-sleeping. Clearly, this method is quite lousy !
The question is what is the best way to sleep. The secret is:
It suffices to say that with practice, this method can be improved to infinity. One nap is enough to last you forever!