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One who eats more than required will dream very much while sleeping, and he must consequently sleep more than is required. One should not sleep more than six hours daily. One who sleeps more than six hours out of twenty-four is certainly influenced by the mode of ignorance. A person in the mode of ignorance is lazy and prone to sleep a great deal. Such a man appears to be always dejected and is addicted to intoxicants and sleeping.

In the Gita Krishna cautions that one who dreams too much while sleeping cannot properly execute yoga. One should not sleep more than six hours daily. Nor can one infected by insomnia, who cannot sleep at night, successfully execute yoga, for the body must be kept fit. Thus, Krishna outlines so many requirements for disciplining the body.