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 eyes will not comment. And the brain waves will slow down
Stage 3 brain waves will slow down so much
.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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