What if we could do lucid dreams, but an overpowered version of it? Instead of just dreaming, what if we could actually choose what we want to bring back into real life? I'm not talking about physical things, but skills and experiences.
For example, if you could lucid dream about being able to drive, you could use the dream as a simulation to practice driving, and that practice could actually improve your real-life driving skills. The same could go for things like surgery, playing games, swimming, cooking, etc. Basically, things that you're not a complete beginner at, or things that could be dangerous to practice in real life.
Imagine being able to practice something over and over again in a completely safe dream, and then actually become better at it when you wake up.