Alone in a quiet room. What do I hear?

Alone in a quiet room it is night time, and fairly quiet. In the dark the first things I hear are the constant hum of the refrigerator/air conditioner, the short puffs of breath coming from my sleeping puppy next to me, the occasional beep from a text message, and the cars zooming by outside. I hear creaking from the movement of other people in the house as they move in their sleep, and my cat crying out randomly in the dark as she always does. As I type I hear the keys clicking and the fan of my laptop coming on every once and a while. I also hear a noise I am unaware of. It is sporadic and sounds like the water pump? but no one is using water, unusual. Going back to the prominent sounds around me I hear the different consistency's in breath from my puppy as though he's having vivid dreams. His breaths are short and fast, and then suddenly drop to deep slow breaths, and this continues. I wonder what he's dreaming of. I can hear myself breathing as well, and the gurgles and sounds of my hungry stomach seeing as I haven't eaten since this afternoon.