I've noticed that sometimes I 'hear' voices in my head when I'm in a very quiet place, and letting my mind empty. I think I'm 'hearing' part of my 'dreaming mind' in a way. Here's a sample. Note we've been watching a lot of old Frasier episodes this spring:
Frasier: once you get some soundproofing on these walls I will move to Scotland.
Niles: Frasier, can you ever forgive me? I've been such a boorish lout.
Frasier: oh, don't worry about it Niles.
Someone unknown: don't bother me with that now. Leave me alone. I'm going after my