Fake Spells / Real(ish) Latin

Dormite / Dormi - Sleep
Denique diatem efficacem inveni - I have finally found an effective diet
Credo Elvem ipsum etiam vivere - I believe Elvis is alive
Fulmina venite - Come lightning
Tibi gratias agimus quod nihil fumas - Thank you for not smoking
Nullae satisfactionis potiri non possum - I can't get no satisfaction
In toto ancto es - You're in for a world of hurt*

(*This one seems to be entirely inaccurate!)