"Voler la Lluna en un cove": this expression mean you want anything impossible.
"Estar de mala/bona lluna": this expression mean you are in a good/bad mood.
"Estar a la lluna de València": this expression mean to be absent-minded, forgetful.
"Demanar la LLuna": this expression mean you ask anything impossible.
"Tenir llunes algú":this expression mean somebody has a mood which is changing continuosly.
"Lladrar a la Lluna":this expression mean that you talk, ask or claim without possible answer.