Fantastic Beasts and Where to Find Them question

so few years back i read a book about two kids a boy and a girl who were travelers and could travel to another dimension through their dreams i think the girl couldn’t walk
also constellations had something to do with the dimensions
i also think that the boy and the girl knew each other in real life and they met when they dreamt
it was a series of books
(added a random book on top because i didn’t know how not to add any!)