I tend to hear voices when I'm trying to go to sleep. Never at any other point during the day, whether I'm alone or enveloped in silence or anything. Only when I try to sleep.

Nothing insane, like somebody whispering into my fucking ear or something. Christ, I'd go nuts. I just hear an occasional yell, sometimes distant and sometimes close. Sometimes different sounds, but all distinctly voices. It's often unintelligible, but sometimes I can make out distinct words (always said quickly; never drawn out for longer than just a second). I don't know what factors influence this; I want to say higher levels of stress result in clearer voices, but I have no evidence of this nor can I say I'm confident in that observation. Never any visuals or hallucinations. Purely just occasional noises. I can't say if they sound like they come from within my head or from outside; anytime they distinctly sound like they're from outside, it freaks me out and I turn on a light for a few moments before recognizing what just happened and trying to go back to sleep.

I'm kind of comfortable with it. Depending on what I'm thinking out, sometimes the voices will echo my thoughts and it makes me feel like I'm talking to people or at least I'm not alone, and I like it. There aren't any personalities or commonly recurring voices; nothing that distinguishable, at any rate. If I focused, I might be able to regularly identify some, but I've never bothered. I don't think there's any recognizable pattern in any case.

To an extent, it occasionally scares me, as I've only truly begun noticing it within the past year or two. I'm not sure if it's something that's always been there and I never realized it or if it's something that I've acquired recently. I legitimately have no idea. Last night I know for a fact that there was total silence as I was going to sleep (only now that I think about it), but I can't remember the night before that or further back. No idea what starts it or stops it. I know that tonight will likely be loud because I can feel a sort of presence outside of my head, sort of like a physical sensation of tinnitus. I'm currently alone in my room with the fan on, but I don't feel alone, because I know those voices are there with me. I don't know how else to explain it, but it's an innate feeling.

Not really an answer to your question at all. Just sort of felt like sharing.