To sleep over is "passer la nuit" in French. Ex: les enfants passent la nuit chez Jack : the kids are sleeping over at Jack's place.
In French, you would say "Je dors beaucoup." This translates directly to "I sleep a lot." The verb "dormir" means "to sleep," and "beaucoup" means "a lot."
Are you going to sleep is est-ce que tu vas dormir ? in French.
You would say "j'ai bien dormi" in French to mean "I had a good sleep."
J'aime dormir.
dormez bien
tu as bien dormi?
J'aime dormir
Using the 'impératif', this is 'dors!' in French.
j'essaie de dormir
'nous aimons dormir'
Je veux dormir
peux pas dormir