That's a fairly normal time for parties, especially with friends. Even though I mostly do this in my home village (so ~500m from home), it's common to party til 6 am, or rather until someone complains to the police, for many festivals.
Mute people would use a text-to-speech program where necessary, or if you're deaf you could use a text service or an application.
I'm not saying there aren't reasons for it, I'm saying it's my job as a parent to teach independence regardless of their situation. But maybe this is a child and not an adult?