I'd like to know if I can train something in a dream and increase this skill in real life.
For exemple:

1. Theorical exercices (doing math in a dream, for exemple)
2. Physical or mechanical exercices (practice a sport or train a musical instrument)
3. Gym exercices (I know this one looks funny and unlikely, but it would be cool if we could just sleep and wake up brawny)

Thanks for the attention~