You know tat low thumping noise, it kinda sound like some one /thing was growling(sorry phone has no auto correction). @ first i thought a tiger was in the room..but as blind as i am, N half a sleep. I never figure out where tat noise was cum'n from. Of course my wife sleeps like a rock..so she would of never be a woke for any thing. Lol. She's a deep sleeper..un like me, N deaf as i am, i'm a light sleeper..