◪Sleep stage: close your eyes and start to sleep. Your brain wave gradually slows down and you are in a relaxed state. After a few minutes, your heart beats slowly and steadily, and your breathing is deep and regular. At this time sleep is very shallow, belongs to semi sleep state, can receive peripheral sound, this stage can maintain 10 seconds to 10 minutes or so.
◪Light sleep stage: at this time, the brain wave will show sharp fluctuations, lasting about 10-20 minutes, the body into a relaxed and static state, consciousness gradually separated from the surrounding environment, this is the beginning of real sleep.
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