“Just 5 more minutes…” but ended up sleeping 3 hours??

Human sleeping pattern has several episodes each having various stages and lasting for approximately 90-120 minutes. Curious why is it so hard to break the sleep cycle in between?? There are two types of human sleep- NREM(non-rapid eye moment) and REM(rapid eye moment). A human sleep episode begins with a short period of NREM which …

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