Let's say, hypothetically, that you fell asleep at 10PM, and you were woken up by a noise at 1AM. If you went back to sleep immediately and woke up at 6AM, you will feel tired even though you had slept for 8 hours. However, if you sleep for 8 hours straight , your body will feel rejuvenated. Is it because of REM sleep being cut off and restarting again?
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