The busy box that is your brain is hard at work all day long—and it doesn’t quit when you’re asleep. Not only does your brain fill your slumber with dreams, it also goes right on solving the problems that plagued you during the day, often coming up with solutions by the time you wake up.

The idea of sleeping on a problem and seeing if you can get some clarity in the morning is a common one, but is it scientifically sound? A growing body of research says yes.

The latest piece of evidence that sleeping on a problem actually works comes courtesy of a small study recently published in the Journal of Neuroscience . A group of 25 people did a memorization task while wired up to an electroencephalograph (EEG) and magnetoencephalography (MEG) so the researchers could monitor which portions o

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