Stage 1 is a shallow sleep. Could be to wake up easily. The eyeball to move very little. Some people wake up or feel twitching. Or feel like fall is born in this period.Stage 2 eyeball is motionless and brain waves will slow down.Stage 3 brain waves will slow down.Stage 4 brain will create brain waves called delta wave during the phase 3 with 4 is a deep sleep and wake can be difficult. In small children, if there is a nightmare, or sleep, or bedwetting will happen during this period.
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