YES it is possible to learn while lucid!

But it's normally more like practicing things you would normally practice, like singing or martial arts. I'm not sure if you'd be able to recall all that much information from a dream in the morning, but it's worth a shot. If you want to try it, go for it--just don't depend on that one lucid to give you the information you need to pass a test or something.


And btw, welcome to Dreamviews!