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For a normal person, about how long does a cycle of sleep (from stage 1 to stage 4 and back again) last?
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Sep 18, 2018
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For a normal person, about how long does a cycle of sleep (from stage 1 to stage 4 and back again) last?
Biology
high-school
Alex Zywicki
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Hey You!
It lasts about 90 minutes for a normal person.
Wejd DAGHFOUS
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Sep 24, 2018
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Wejd DAGHFOUS
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