अनुबाद - इतालियन-स्पेनी - Buona notte!

Creo que "se va a dormir" sonaria mejor

Yes, Lilian, I agree with you.

I agree too lilian. "se va" sounds better.
But I see "M. va a dormire".
I wanted to remain close to the original form of the sentence, without adding new words.
If it was "M. se ne va a dormire", I would translate "M. se va a dormir".
However I think the meaning and the rightness of the sentence don't change.

Hola meridi, a veces tenemos que cambiar un poco las expresiones para que en el idioma alvo suenen naturales. Aunque no sea textual, en español se diría "se va a dormir" es una acción que llama al reflexivo (irse, levantarse, etc)

I found many sentences and spanish texts with both of situations "ir" and "irse".
But you are a spanish expert, so I'll follow your suggestion
Just tell me if I have to change the translation, or you'll do it.

Actually, only the expert in charge (Isildur) can edit the translation after the poll was set, let's wait for him to do it

CC: Isildur__