The Purpose of Sleep? To Forget, Scientists Say

Two studies suggest that the brain edits itself during sleep, paring back the tangle of neurons that grows in waking hours.

We sleep to forget some of the things we learn each day. In order to learn, we have to grow connections, or synapses, between the neurons in our brains. These connections enable neurons to send signals to one another quickly and efficiently. We store new memories in these networks.

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