Isis does that as well as looking in the other room or around the room...she sniffs the air most of the time for changes...and thats when she gets up if somethings different...actually picked up on someone outside our gate yesterday..we were upstairs in my room she was 1/2 asleep on my bed...she started looking up...then sniffing, sat up, woofed a little....looked out the window and started woofing more...there WAS someone out there ! the mailman...
its amazing what deaf dogs teach themselves...its a wonderful experience...you are going to love it..promise !!