Abhyasa Yoga-Bhagavad Gita Chapter 6 [The Science of Self Realization]
Krishna Said > Shaloka: 17
He who is temperate in his habits of eating, sleeping, working and recreation can mitigate all material pains by practicing the yoga system.
Extravagance in the matter of eating, sleeping, defending and mating–which are demands of the body–can block advancement in the practice of yoga. As far as eating is concerned, it can be regulated only when one is practiced to take and accept prasadam, sanctified food. Lord Krishna is offered, according to the Bhagavad-gita (Bg. 9.26), vegetables, flowers, fruits, grains, milk, etc. In this way, a person in Krishna consciousness becomes automatically trained not to accept food not meant for human consumption, or which not in the category of goodness. As far as sleeping is concerned, a Krishna conscious person is always alert in the discharge of his duties in Krishna consciousness, and therefore any unnecessary time spent sleeping is considered a great loss. A Krishna conscious person cannot bear to pass a minute of his life without being engaged in the service of the Lord. Therefore, his sleeping is kept to a minimum. His ideal in this respect is Srila Rupa Gosvami, who was always engaged in the service of Krishna and who could not sleep more than two hours a day, and sometimes not even that. Thakura Haridasa would not even accept prasadam nor even sleep for a moment without finishing his daily routine of chanting with his beads three hundred thousand names. As far as work is concerned, a Krishna conscious person does not do anything which is not connected with Krishna’s interest, and thus his work is always regulated and is untainted by sense gratification. Since there is no question of sense gratification, there is no material leisure for a person in Krishna consciousness. And because he is regulated in all his work, speech, sleep, wakefulness and all other bodily activities, there is no material misery for him.