[monological]

Main reason is due to purging of β-amyloid by the glymphatic system, which seems to happen during deep sleep. High β-amyloid plaque build up is correlated with Alzheimer’s disease.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7698404/

[Tarq0n]

The causal relationship between amyloid plaque and alzheimers is controversial nowadays.

[monological]

It's not "casual". Did you read the paper I linked?

[n8henrie]

Unclear if there was an edit, a typo, or a misreading with regards to the word you've "quoted."