Deep sleep is a deep rest in which the brain does not perform activities after the body falls asleep. The body enters a light sleep, then naturally enters a deep sleep, then another light sleep, then another deep sleep, alternating back and forth between deep sleep and light sleep until waking up. Deep sleep is called the “golden sleep”, which accounts for 25% of the entire sleep time and helps to restore one’s strength and energy. If you feel that you are not sleeping well, try the following methods to help you enter deep sleep more easily: 1, physical and mental relaxation: before going to bed, you can listen to soothing music, so that the whole body and mind to get fully relaxed, avoid emotional excitement. You can also promote blood circulation by soaking your feet before going to bed, so as to achieve a relaxed state, easier to enter deep sleep; 2, reasonable diet: avoid hunger or eating too much before going to sleep, avoid drinking alcohol, coffee, strong tea and other stimulating drinks; 3, good rest habits: try to go to bed early and get up early, nap time should not be too long, to establish a good biological clock, easy to enter deep sleep; 4, good sleep environment. Sleep dormitory light should be dark, the surrounding environment is quiet, the temperature and humidity is appropriate, the temperature at 22 ℃ -26 ℃, humidity at 40%-60% is appropriate.