Bonjour Ann !
This one is quite a tricky case!
The fact is that rêver à + [quelque chose] is very rarely used, and always in a figurative context, something you're considering:
rêver à de futures vacances... butrêver de toi
For every other case, it would be rêver de.
And to say to dream of [doing something], you'll always use rêver de [infinitif]:
Je rêve de faire le tour du monde.Il rêvait d'aller en Espagne.
I hope that's helpful!À bientôt !
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