Watch what you are doing. Watch each act. De-automatize each act. Remain constantly alert. Walking, watch each step. Eating, watch. Even while going to sleep, go watchfully into it, into what is happening: slowly, slowly the body relaxes, the limbs relax. Watch, feel… the coolness of the bedsheet, the softness of the pillow. Be sensitive, be watchful: then slowly, slowly the mind is moving into another dimension, the dimension of sleep; you are just in between – a little awake, a little asleep. Watch. Go on watching, go on watching as long as you can, and one day it happens: you fall asleep, and yet watching continues. Then one learns how to watch the dreams.
Then on another level, one day you can even watch your deep sleep, dreamless sleep. And then finally, when you have been able to watch your waking life, your dream life, your sleep life, you have arrived to the fourth state. Just the other day I was talking about turiya, the fourth state. You have come home, you are alert.