Have you ever heard sounds or voices right before you fall asleep?

This is something that's happened to me more than once, and now that it's happened to me just minutes ago (and since I now have free time on my hands) I thought I'd post my question about this online.

Every now and then, just as I'm about to fall asleep....that moment before I slip into unconsciousness I will hear the voice(s) of people or sometimes faint music. Keep in mind, this always seems to happen when I'm alone.

At that precise moment, as I hear the voices/sounds I'll wake up and of course....no more sounds. And no....I don't hear voices all the time (I'm not some nutjob....ugh....whatever).

So is there a rational explanation for this?