There are numerous well-known applications for lucid dreaming:
- Path to enlightenment
- Facing your fears
- Creating new music and art
- Inventing new technology
- Developing new scientific principles
- Inspiring literature and movies
- Problem solving
- Improving your confidence
- Practicing new skills
There are also speculative applications still being researched, such as the ability to heal your physical body. We know the mind has some potential to heal the body (placebo effect) so this is an exciting area of research...
The original question asked whether we could LEARN anything new from our lucid dreams? In the strictest sense, there is no evidence to show that you can pick up truly NEW knowledge (such as a language you've never heard of or studied before) because this information would come from outside your mind.
However, you can gain access to a pool of subliminal knowledge and insight which resides in your subconscious mind, and this can yield seemingly new information (such as where you lost your wallet, or a "forgotten" childhood memory).
I'd like to know what do YOU use lucid dreaming for? Do you have specific ideas you hope to implement in future? Can you tell us how you applied any of the above to your dream life?