At what time is sleep tha most refreshing?
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Stage 1 non-REM sleep is the changeover from wakefulness to sleep. ...
Stage 2 non-REM sleep is a period of light sleep before you enter deeper sleep. ...
Stage 3 non-REM sleep is the period of deep sleep that you need to feel refreshed in the morning. ...
REM sleep first occurs about 90 minutes after falling asleep.
Explanation:
MARK the brainliest ..
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