Sleeping is a great time for the brain to synthesize and assimilate recently learned things, so new ideas stemming from what you’ve learned could manifest in a dream. Like the structure of benzene that came to a scientist in a dream and now is the accepted chemical structure.

I personally once had this dream where I got blonde hair and blue eyes and while playing baseball, I noticed that the sky was brighter than usual and the sun’s glare was really bad. Found out later when I got up that people with blue eyes do see more glare when it is bright out.

As for learning in the sense of having a TV or speaker on an educational program while you sleep, it’s enough to disrupt sleep patterns, but hasn’t consistently been shown to be enough for learning.

I was(I guess still am) really into lucid dreaming in college. You can kinda teach yourself how to do this but it’s a lot of specific things you have to do … Like every time you walk thru a doorway, ask yourself, how did I get here? Like what was the pathway, reason and such. If you don’t recall, you’re likely dreaming.

There’s also a tea you can make that helps… But it tastes pretty bad…but quite effective. I can’t remember the scientific name but the ‘Mexican leaves of god’ should point you in the right direction…calea something with a z… I think. and blend it with normal tea. It can be smoked…but I found the tea way more impactful.

We always dream, but usually we cant remember the dreams. It helps to keep a dream journal, ie every morning directly after waking up, write down as much as you remember from last nights dreams (or instead talk about it with someone). Over time you will remember more and more details.