"You know how when you just flop on your bed and think, 'I'm just going to take a short nap' and then when you wake up it's 2 hours later?" Does this happen to you?
I normally don't take naps, because if I do, I won't be able to go to sleep that night. A few weeks ago I did take a nap on a weeknight cuz I was just so tired. I laid down at 4:30PM and our dogs were barking and woke me up and I saw that it was 6:30. I got out of bed, wondering why I'd laid down in my clothes, and stumbled out to the kitchen where I saw my wife at the kitchen sink. I wondered what she was doing up so early since she's a night owl...then I remembered that I was still in my clothes and that it was not 6:30AM, but PM. It was quite disconcerting for awhile.
ETA - Oh yeah, I was able to sleep quite well that night!!