Ghosts are ringing my wind chimes

I recently had an awful sleepless night, awaking at 12.15am to wind chimes.  Wind chimes?  I don't even have any - part of the reason I could not go back to sleep.  I tried to get the sound our of my head, but found myself concentrating even harder to see if I could hear it (which is REALLY annoying!).  

By 1.00am I had to go and look for the chimes ... but they stopped as soon as I got out of bed ... so back to bed.

By 1.45am, I am down in the kitchen looking for them ... still can't find them ... back to bed again.

By 2.00am I have persuaded myself that my daughter has been kidnapped through her bedroom window and the kidnappers have bumped into her wind chime project next to her bed.  So I barrel down the hall ... she is (of course) asleep in bed ... and she's removed the wind chimes anyway.

Figured it out by 3.00am by sitting motionless on the floor in the hallway for 10 minutes.  Stupid hamster ... jumping on and off it's wheel.  Bing ... Bing ... Bing   (should be bang bang bang ... but I haven't got a gun)