The brain uses REM sleep to cut unneeded connections

arstechnica.com

REM sleep is known to help solidify memories, but the mechanism for making memories more permanent is not well-understood. A recent study published in Nature Neuroscience shows that, during REM sleep, some of the structures neurons use to make connections with each other are pruned, while others are maintained and strengthened. The findings indicate that sleep's role in solidifying memories comes through allowing the brain time to selectively eliminate or maintain newly formed neural connections.

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