How the brain cleans itself during deep sleep

During a good night’s sleep, the brain gets busy cleaning itself, flushing out waste products that have built up during the day. A study in mice shows how a molecule called noradrenaline, which causes blood vessels to constrict, powers the brain’s natural cleansing system during deep sleep¹.

doi: https://doi.org/10.1038/d41586-025-00007-4

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