Stages 3 and 4 are when you experience deep sleep.
This is the stage of sleep you may fall into more than any other throughout the night. Stage 2 accounts for about 50 percent of the total sleep cycle. your brain waves start to slow down from their wakeful state.
Stage 1 of non-REM sleep lasts several minutes as you move from being awake to being asleep.
The cycle continues throughout the night about every 90 minutes.ĭeep sleep occurs in the final stage of non-REM sleep. You begin the night in non-REM sleep followed by a brief period of REM sleep. Sleep is divided into two categories: REM and non-REM sleep.
