Light sleep is relative to deep sleep, sleep is very important to the human body, in the process of sleep can regulate various physiological indicators, discharge some toxic substances, so that the human body’s physiological functions, memory function are restored to a better state, physical strength can also be restored. But sleep is divided into shallow and deep, sleep has a section, each night to experience 4-5 sleep stages, where the beginning of each sleep stage is light sleep, gradually into deep sleep, and later into light sleep, and then into deep sleep, each night there are 4-5 such sleep cycle. Deep sleep is very important for the recovery of all human functions, light sleep is not so good, so the human body needs a certain amount of time of deep sleep. If you are in light sleep for a long time, the quality of sleep is not too high, and all physiological functions will be affected more obviously, and people will be very uncomfortable. If you are in light sleep for a long time, you need to make artificial adjustments.