Two nights ago, our pipes starting humming. It's a noticeable sound, coming from the pipe leading to the water heater, and especially loud in our bedroom. I woke up this morning to find that Kevin wasn't in bed -- I found him in the tv room, on the couch. He said that he'd moved because the humming was keeping him awake. But then he said that the pounding was worse. That's when I noticed the distinct sound of someone hammering. At 6:30 a.m. It had apparently been going on for a while. I, of course, can generally sleep through anything, but he'd been up most of the night. Poor munchkin.
Usually our condo is exceedingly quiet -- not really sure what's going on, though I think the pizza place downstairs is being renovated (at 6:30 a.m.??) and the management company did do some work on the plumbing a few days ago. Still, weird. A mystery. Must investigate.