For several years, I wasn’t getting enough sleep (too busy, like most people).

During the COVID years, I was able to sleep 8 hours a day. After a few months of that, I had already noticed my memory improved a lot.

Now it’s been years and I can recall various random things in much higher resolution levels than before (faces details, conversations details, chess patterns, second language rules, my own ideas).

So much so that I have now made it a top priority to get my 8 hours of sleep every day, because I now remember how much of a time saver it ends up being.