No i doubt you can, but you should try.

I agree with alban, it doesnt make sense to learn stuff in your dreams because your dreams are made up of past experiences and your own imagination. So i wouldnt think you can learn things that other people would possibly know. I guess you could learn from Kurt in your dreams but you would be learning what your imagination tells you. Besides why would you learn from Kurt Cobain when there are better guiter players... LOL