Half an hour to an hour is best. If it takes too long, you will feel dizzy and bored after waking up.

(2) Take a "serious" nap

Is to adjust your mood and sleep peacefully. Lu You, a writer in the Song Dynasty, said: "Huashan Chu Shi is like a guest. If you can't find a fairy, you can't find a place to sleep." What is a "sleeping party"? It is to eliminate all distractions in your heart and make your sleep effect reach the best state.

(3) Stay in bed and sleep

Don't "sleep on your stomach" at your desk or "sleep on the sofa", which will lead to insufficient blood pressure in your head, insufficient oxygen inhalation, reduced blood flow in your head and "cerebral anemia". Lying "with arms crossed" at the desk, using hands instead of pillows will oppress eyes, numb hands and feet, and make some muscles still tense and unable to get enough rest.

(4) Don't take a nap immediately after lunch.

Just after lunch, the digestive system is working. At this time, taking a nap will reduce the digestive function, so you should go to sleep after meals 10 ~ 30 minutes.

(5) Choose a suitable environment

Take care not to sleep in noisy places, under the eaves, in the aisles or in the open air. Because after falling asleep, the body temperature will drop, muscles will relax, capillaries will expand and sweat pores will widen. When the wind blows, you will catch a cold, which will reduce people's immunity and then induce other diseases.

(6) Sleeping when sleepy

Don't take sleeping pills during a nap, just let nature take its course, and don't rush to fall asleep artificially.