The study found that the clearance and movement of fluid in the brains of mice was, in fact, markedly reduced during sleep and anaesthesia.
The field has been so focused on the clearance idea as one of the key reasons why we sleep, and we were of course very surprised to observe the opposite in our results.
We found that the rate of clearance of dye from the brain was significantly reduced in animals that were asleep, or under anaesthetic.
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