Either chant Hare Krsna or read books. And when you are hungry, you take little prasadam. Don't take much — then you will sleep more. Take as little as possible. Then you will also sleep… Our business is to conquer over the demands of the body. The demands of the body is eating, sleeping, sex and defense. So spiritual life means make it almost nil. Nidrahara-viharakadi-vijitau. All the Gosvamis, they did so. They conquered over sleeping, conquered over eating, conquered over sex desire and conquered defense. So in this way we have to minimize nidrahara-vihara and save time for chanting Hare Krsna. [break] [indistinct] And chant Hare Krsna.

From Srila Prabhupada's lecture on Bhagavad-gita 13.4 — February 27, 1975, Miami