[ahmed_ds]

This reminded me of Sleep Learning. This topic has the oddest Wikipedia page [0]. You would expect this topic to have research, historical background and other sections. But 80% of that page is just references to fictional literature.

0: https://en.wikipedia.org/wiki/Sleep-learning

[scollet]

I remember reading an article about this years ago that stacked evidence against this practice.

Slightly more useful might be lucid dreaming. I can imagine that a stable lucid dream would be great for knowledge synthesis.

[crehn]

Tangentially, studying right before sleeping has always been one of the most effective way for me to memorize stuff.