People often ask me some sleep problems .Sleep is the need of life, so people can not survive without sleep. About one third of life is spent in sleep, and sleep can restore the spirit and relieve fatigue. Today we will talk about what is the difference between deep sleep and light sleep? Human sleep is rhythmic, deep sleep and light sleep alternately repeated until awake. Studies have shown that in the deep sleep period, the human cerebral cortex cells is in a fully resting state. It is extremely important for the stability of the mood, balance of mind and recovery. Deep sleep is a part of sleep, only 25% of the total sleep time, which is also known as "golden sleep". At the same time, the [...]