I've taken naps and woken up at 6 and couldn't tell if it was AM or PM.

I’m 39 and still sometimes dream about being late for an exam and then wake up stressed and annoyed

When I was like 21 my sister messed with me. I was taking a nap during summer break. She busted into my room and yelled, "get up! you're going to be late for the bus!" I almost had a heart attack and it took like a full minute to realize I hadn't taken the bus in 7 years, I was on summer break from college, and she was a total jerk.

A couple of years ago I woke up from a rare afternoon nap. But I thought it was morning, because the sun outside was setting so the light was dim, which I took for the sun rising, which is usually when I get up. The time was about 6:30, which was the right time for me to wake up. So I got my morning coffee, and sat down in front of the computer for a bit of browsing. It was a typical morning, until I noticed it was getting darker outside, instead of lighter. I peeked out the bedroom window to the southern sky to see if it was overcast. Nope.

Anyway, it took me about twenty minutes to realize it wasn't morning and to remember that I had laid down for a nap.

It's Sunday, yes, but...I'm 40? Uh-oh. Hooooly shit, I think I just took an 8 year nap.

Yes, and it doesn't happen often enough. That is top tier napping.