It is strange that you brought this up. My daughter today told me that just before she goes to sleep she sometimes heres people talking. She says in her jargon, "Its just jibber jabber, but they are talking."
I had no idea what to say about it because she is not one to make up things like that. She actually asked me if I ever heard it. (I don't)
I just told her not to worry about it and if she can make anything out try to remember it so she can tell me what they are saying.