Subconsciously you are probably mulling things over in your sleep, the result
might have woken you up, although you might not necessarily remember it.
Used to happen to me when I was doing college projects. A few times I'd have
problems getting some code to work and so I'd forget about it and hit the hay.
Ended up dreaming about how to fix the problem, suddenly wake up and hey
presto, 9 times out of 10 the solution I had the dream about worked!
When you switch off on a topic, your brain keeps working on it in the background

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