养身三大事，一睡眠，二便利，三饮食，其余起居、服装等皆是辅助。
三事中睡眠第一。然胃纳不和者，夜眠不安，故以通便利为第二。
而饮食无节，饥饱过度者，肠胃必受伤，而营养日减。
睡以安神为主，神以心安为主，应配合年龄，壮年至多七小时至八小时，多睡则智昏头晕眼红胀，四肢疲软，童年必睡足八小时，或过九小时勿碍，老或病人至多六小时已足。
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