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That's a very good question. That's the kind of question that would come from a curious child. Something that an adult would just take for granted and not bother wondering about. I'm impressed, and a little envious (not jealous) that I didn't think of that question.
I'm going to hypothesize that the bowels are less active at night, and so they know that it's night time because nothing is moving.
I'll follow up with a question. How do they know which way is out?
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