There’s a scientific reason your naps leave you feeling like you’ve just been hit by a bus

There’s nothing quite like lying down for a quick afternoon nap, closing your eyes for what feels like five minutes, and waking up convinced it’s 3am, you’ve missed three years of your life and you need to immediately reassess every decision you’ve ever made.

I took a nap for the first time in weeks and woke up feeling nauseous and a bit tachy 😵‍💫

— No me joda (@notinorbitem) August 27, 2026

Because why is it that a nap is supposed to make you feel better, yet sometimes you wake up feeling approximately 400 times more exhausted than when you went to sleep?

If you’ve ever woken up from a nap feeling groggy, confused or genuinely unsure what planet you’re on, there’s actually a reason for it. And no, it’s not because you’re lazy or somehow bad at napping.

The culprit is something called sleep inertia, also known as sleep drunkenness. Which, frankly, feels like a very accurate name for the experience.

So why do naps make you feel so weird?

Via Canva

Basically, it all comes down to when you wake up.

If your nap goes beyond around 30 to 40 minutes, your brain can slip into deep, slow-wave sleep. And waking yourself up in the middle of that is basically like violently interrupting your brain while it’s in the middle of an important meeting.

Your brain doesn’t just flick instantly from fully asleep to ready to answer emails. Some parts take longer to wake up than others, meaning your blood flow and electrical activity can remain sluggish for a little while after you’ve opened your eyes.

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That’s why you might experience mental fog, slower reaction times, irritability, an overwhelming desire to get back into bed, and even feeling hungover despite having consumed absolutely zero alcohol.

Your brain is essentially still booting up. Give it a minute.

So how are you actually meant to nap?

just woke up from a 4 hour nap i feel like a baby bird that just hatched

— ᶜᵒᵘʳᵗ (@tropicaIghost) August 22, 2026

Unfortunately, the answer isn’t to simply surrender to the duvet and hope for the best.

For a nap that actually leaves you feeling refreshed, aim for around 20 minutes in the early afternoon. Set an alarm, keep your surroundings calm and dim, and resist the temptation to turn your “quick nap” into hibernation.

There is such a thing as too much of a good thing, and nothing ruins the smug feeling of having had a productive little power nap quite like waking up three hours later with no idea what day it is.

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Featured image via Canva