eli5 If dreams appear in after a couple hours in the REM stage of sleep, then why do I have dreams in my 30 minute naps?
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If a person is very tired due to lack of sleep, the body can enter REM sleep more quickly. Some people don’t realize that they are chronically sleep-deprived.
Medical conditions can play a role as well. Narcolepsy can cause a person to enter REM sleep very quickly.
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