Comment by g3e0

Reminds me of the theory that dreaming (and music) evolved to "practice" hypothetical situations and emotions before they happen - https://whatismusic.info/blog/AUnifiedTheoryOfMusicAndDreami...

It's easy for me to believe that this could have initially evolved to give babies slightly more preparation for the outside world (and therefore a slightly higher chance of survival), and that we just happen to retain the ability throughout adulthood.