Get up early in spring and summer and sleep in autumn and winter. What does this sentence mean after the strict death day and before the cock crows?

This is the ancient people's concept of health preservation and the law of life. From the Essentials of Class Repair and Health Care

Spring and summer are suitable for getting up early, but in autumn and winter, you are allowed to sleep late and get up late, but you can't sleep until sunrise at the latest. You should get up early before the cock crows. Sleeping quietly means going to bed late and getting up late.

) This is a regimen formulated by the ancients according to the meridian theory of traditional Chinese medicine and corresponding to the twelve-point qi and blood operation law.

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