BG 6.17

6.17 युक्ताहारविहारस्य of one who is moderate in eating and recreation (such as walking? etc.)? युक्तचेष्टस्य कर्मसु of one who is moderate in exertion in actions? युक्तस्वप्नावबोधस्य of one who is moderate in sleep and wakefulness? योगः Yoga? भवति becomes? दुःखहा the destroyer of pain.Commentary In this verse the Lord prescribes for the student of Yoga? diet? recreation and th like. The student of Yoga should always adopt the happy medium or the middle course. Lord Buddha went to the extremes in the beginning in matters of food? drink? etc. He was very abstemious and became extremely weak. He tortured his body very much. Therefore he was not able to attain to success in Yoga. Too much of austerity is not necessary for Selfrealisation. This is condemned by the Lord in chapter XVII? verses 5 and 6. Austerity should not mean selftorture. Then it becomes diabolical. The Buddi Yoga of Krishna is a wise approach to austerity. Some aspirants take asceticism as the goal it is only the means but not the end. The nervous system is extremely,sensitive. It responds even to very slight changes and causes distraction of the mind. It is? therefore? very necessary that you should lead a very regulated and disciplined life and should be moderate in food? sleep and recreation. Take measured food. Sleep and wake up at the prescribed time. Sleeo at 9 or 10 p.m. and get up at 3 or 4 a.m. Only then will you attain to success in Yoga which will kill all sorts or pains and sorrows of this life.

— vedicscriptures · exposition · source ↗

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 prasādam, sanctified food. Lord Kṛṣṇa is offered, according to the Bhagavad-gītā (9.26) , vegetables, flowers, fruits, grains, milk, etc. In this way, a person in Kṛṣṇa consciousness becomes automatically trained not to accept food not meant for human consumption, or not in the category of goodness. As far as sleeping is concerned, a Kṛṣṇa conscious person is always alert in the discharge of his duties in Kṛṣṇa consciousness, and therefore any unnecessary time spent sleeping is considered a great loss. Avyartha-kālatvam: a Kṛṣṇa 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 Śrīla Rūpa Gosvāmī, who was always engaged in the service of Kṛṣṇa and who could not sleep more than two hours a day, and sometimes not even that. Ṭhākura Haridāsa would not even accept prasādam 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 Kṛṣṇa conscious person does not do anything which is not connected with Kṛṣṇa’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 Kṛṣṇa 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.

— vedicscriptures · exposition · source ↗