The moment you are awake, you start pretending. Your wakefulness is a long long pretension. Hence sleep is so relaxing, because to be continuously on guard and say the things which are supposed to be said, and do the things which the society requires to be done, is tiring, very tiring. One needs to fall into deep sleep every day for eight hours to get rid of all this, to be natural again, to forget the society and the nightmare and the hell that it has created.
The more alert you become, the more watchful you are, the more free from the bondage of the society and its clutches, then only your body will need sleep, and even in your sleep there will continue an undercurrent of awareness.