Yeah I think like the others have said it's that your brain was too addled by sleep to wake up in time. Especially since you were dreaming about it, it meant your physical state was intruding on your mind. I wouldn't worry unless it happens for no apparent cause or if it happens in the day too.
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That's why it's such a serious thing to ask a Centaur to stay for the weekend. A very serious thing indeed.
- The Silver Chair
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