And for many of us, it simply feels good.
As Fenn notes, this is the most important stage of sleep.
One was given the option to take a nap, while the other was not.
Before sleeping, the groups performed cognitive tasks.
Why Naps Don't Actually Relieve Sleep Deprivation
The longer you nap, the closer you are to experiencing sleep inertia -- waking up feeling groggy, that makes you want to hit snooze rather than get out of bed.
