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“How much sleep is needed for a man to keep himself healthy, strong, and always capable for work is a great problem; it cannot be decided without considering various incidental circumstances besides his own hereditary constitution. But sleep seems to be something that permits much latitude, and discipline or habit can do much to reduce it to its lowest terms.” — Daisetz Teitaro Suzuki
How much sleep is needed for a man to keep himself healthy, strong, and always capable for work is a great problem; it cannot be decided without considering various incidental circumstances besides his own hereditary constitution. But sleep seems to be something that permits much latitude, and discipline or habit can do much to reduce it to its lowest terms.