Smell-O-Vision 2.0

I had another strange experience today. However, I did not need to travel outside of my bedroom for it. When I awoke this morning, I was greeted by the scent of a certain cologne. This cologne I have not smelled in awhile, and the sweet mild scent danced around my nose for a couple of seconds before it drifted away. Again, this is not a product that is used in my home, and it is even stranger that this particular scent should be found in my room. What do you suppose it is? Why does it appear that I am being chased by the scents of products from my past?