Missing out on deep sleep may contribute to Alzheimer's plaques building up in the brain. Scientists studied mice on ketamine and other anesthetics and watched how truly deep sleep improved the brain's ability to clear out potentially toxic waste that can cause dementia.

See the source article by following the link below:
Missing out on deep sleep may contribute to Alzheimer's plaques building up in the brain. Scientists studied mice on ketamine and other anesthetics and watched how truly deep sleep improved the brain's ability to clear out potentially toxic waste that can cause dementia.