Whistle While you Sleep

My baby has been in dreamland for a few hours now, I however have gotten a lot done around the house. I headed upstairs and heard this whooshing noise. On for a few seconds off for a few, on for a few seconds and off, you get the picture. I heard this noise in our kitchen, thru our dining room and right up to the closed bedroom door of Coulter. He must be dreaming pretty hard because the whooshing sound was my sleeping whistler, heard for the first time today.