Yes I always did this. I don't think I was actually daydreaming about anything in particular tho (eventho I do that too sometimes), it was more like an unintentional meditative state (being "in the moon"), and when I was doing this at school (which I did quite often) the teachers would always try to catch me by asking me a question about whatever they were talking about, and I always could answer despite not having been actually paying attention (but I guess there was a side of me that was since I was able to answer their questions), that really annoyed them lol.
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That's the way things come clear. All of a sudden. And then you realize how obvious they've been all along. ~Madeleine L'Engle