Dancing in a dream commonly reflects freedom of self-expression -- movement without self-consciousness, joy that doesn't need an audience's approval to feel real. Dancing with ease can point to a season where you feel genuinely yourself, while stiffness or embarrassment often names a self-expression you're still holding back.
Mercury conflicts with those who are ruled by Jupiter, and Jupiter conflicts with those ruled by Mercury. - Picatrix (Andalusia, ~1000.AD)