Comment by robg

If you have any doubts about sleep quantity and quality, worth reading about the glymphatic nervous system, which is so newly discovered likely you didn’t learn about it in school.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4636982/

In short it explains, mechanistically, why poor sleep affects daily cognition, mental health, and age-related declines. Robust scientific theories explain more of the evidence. The glymphatic nervous system explains why sleep is so key to surviving and thriving. Maiken Nedergaard will end up winning the Nobel for its discovery.