I'm at my parents'. I lie down on the couch to take a quick nap.

Suddenly I wake up, and I'm not sure what time it is. There are several clocks in the room, and they all read different times. My watch says it's 4:20, could that be right? It doesn't seem possible that I slept that long!

I go into the kitchen, and notice that it is dark outside. I ask my mom, who is sitting at the computer, what time it is, and she tells me it's twenty after four.

Oh no! I had a meeting I was supposed to attend at 3pm, and I totally overslept and missed it! I never do that, not even once, I usually wake up just when I intend to! The first time ever!

(I was taking a nap over lunch at my own house, indeed intending to get back to work for a meeting at 3pm. However, I woke up in plenty of time)