For me, one that i've never mentioned to anyone, and always wondered if it's just me.. if I am trying to sleep, with all silence around me, and am just laying in bed or somewhere where there's no movement with my head flat to a pillow.. I alot of the time can hear wierd noises in my head, like a TV is on in another room in the distance and i can hear a tv show, but not sure what one or what's happening just the muffled noise of a tv, or a radio station is coming through a pile of static. I can hear a musical sound but nothing that i can pick, and as soon as i lift my head from the pillow and listen closer, I hear nothing. I think that someone in the house has a tv on but i'm the only one here.. and no tv's are on. Soon as i lay down again and wait for silence, I hear background noise again. I can't tell if it's words, or how many people, sometimes it's just one voice like someone talking on a phone but the muffled sound of talking/background noise comes quite regularly and it's not a bother, it doesn't keep me awake, but it makes me wonder why i'm getting these background noises.