Do you hear what I hear?

My sister Becky has this summed up really well.
Last night I was sleeping soundly. All of a sudden I wake up hearing little pitter patter feet of a mouse scurrying across the floor in the other room. I wake up Russell. This is 3 a.m. He doesn't hear anything. I try going back to sleep. A few minutes later I hear it again. I wake up Russell again. This goes on for some time. Eventually he gets up and goes to the other room to check on flood conditions on the computer. I figure if he's out in the other room there must not be a mouse in the house. I venture out to see if I can still hear anything.
Nada.
Nothing.
Zip.
We go back to bed. I start to fall asleep and start hearing pitter patters running across the ceiling - the roof side of course.
Did you hear that? How can you not hear that? It was right over our heads!
Am I going crazy here? I certainly feel like it. How come you can't hear these noises? Is this mouse just out to get me?

I probably should mention this isn't the first time this has happened either.
So....
Do you hear what I hear?