n. The grogginess and disorientation that a person feels for a few minutes after a sleep or long nap.
1999
'Most people should only nap for 30 minutes or so, ' Camille says. 'More than that and you're getting into deeper sleep.' And the problem with deeper sleep is waking up from it without succumbing to what's known as 'sleep inertia' — that groggy, stumbling-around feeling.
1998
There are two reasons naps can leave you feeling sleepy.
One, you might have a "sleep debt," meaning you aren't getting enough sleep in general. You'll experience sleep debts if you mix late nights with early mornings.
The second reason has to do with something called "sleep inertia." This is linked to how long your naps are.
One, you might have a "sleep debt," meaning you aren't getting enough sleep in general. You'll experience sleep debts if you mix late nights with early mornings.
The second reason has to do with something called "sleep inertia." This is linked to how long your naps are.
1988 (earliest)
"Naps that contains deep or slow-wave sleep may be followed by a period of what we call sleep inertia. which is a kind of post-sleep grogginess and disorientation," Pollak says.