Nap vs. sleep
When you nap for 10 to 20 minutes, you enter into the first and sometimes second stages of sleep. That’s just enough to refresh you and get the benefits associated with napping.
During true sleep your body has the opportunity to complete all five stages of the sleep cycle a few times, which for most healthy adults repeats every 90 to 110 minutesTrusted Source.
When you go into deeper sleep, your brain becomes less responsive to external stimuli, making it harder to wake up and increasing the likelihood of grogginess and fatigue.
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