"Haikun, who went to see this old man who lived in a cave, slept with deer and ate chestnuts and the old man told him to quit meditating and quit thinking about koans, and instead learn how to go to sleep and wake up, said, when you go to sleep you should put your legs together and take deep breaths and then concentrate your mind on a spot one and a half inches below your navel until you feel it get like a ball of power and then start breathing from your heels clear up and concentrate saying to yourself that the center just here is Amida’s Pure Land, the center of the mind, and when you wake up you should start by consciously breathing and stretching a little and thinking the same thoughts, see, the rest of the time.
The rest of the time he said dont bother much about thinkin about nothin, just eat well, not too much, and sleep good, and old Hakuu said he was three hundred friggin years old just then and figured he was good for five hundred more, and by Gawd which makes me think he must still be up there if he’s anybody at all." - From The Dharma Bums