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Masja [62]
3 years ago
6

5) How do researchers know that there are different stages of sleep?

Health
2 answers:
Digiron [165]3 years ago
7 0
By countless hours of research and tests
Law Incorporation [45]3 years ago
4 0
Stages of sleep and sleep cycles. usually sleepers pass through five stages: 1 2 3 4 and REM(rapid eye movement ) sleep. these stages progress cyclially from one through rem then Begin Again with Stage 1. a complete sleep cycle takes an average of 90 to 110 minutes, with each stage last thing between 5 to 15 minutes.
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