There is an old term called meridian sleep. Noon is the time when the yang is the strongest and the yin is the weakest, which means that resting at noon is an opportunity for the body to balance and relax, especially for people who can't go to bed early at night. This is a good opportunity to make up for your body and relax yourself. Nowadays, contemporary college students have to take a nap after staying up late, but they should take a nap instead of sleeping at this time, usually for about half an hour, otherwise they will disturb the body's biological clock and lose sleep at night.

In China, the habit of taking a nap has existed since ancient times. For example, when Liu Bei visited the cottage, Zhuge Liang woke up after a nap and said, "Whoever dreams first, I will know it all my life."

For example, Cai Que's seven-character quatrain "Getting on the bus and building a pavilion in the summer" in the Song Dynasty said that "throwing books in the afternoon is tiring".