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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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For a normal person, about how long does a cycle of sleep (from stage 1 to stage 4 and back again) last?

User Alex Zywicki
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Hey You!

It lasts about 90 minutes for a normal person.
User Wejd DAGHFOUS
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