Sleep stages: There are historically 5 stages of sleep. Stage 1 and 2 being light and the rest being deeper. What it means is that sleep being unconscious, your depth of unconsciousness is deeper. So theoretically it may take more to wake you up.
Answered 4/13/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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