“Why Dreams Don’t Matter (Morally or Psychologically)”, Gwern2021-11-09 (epistemology, psychedelics, illusion-of-depth bias, anesthesia, sleep)⁠:

[Dreams are sometimes suggested to be important morally or for improving quality of life, because they represent a substantial chunk of hours during a lifetime.

But they almost certainly aren’t because dreams have no meaningful intensity: you don’t suffer in a dream, nor can you really enjoy things either. It’s just a simulated shadow of waking life.]