What the beep?

[sistawendy]

I was awakened at 0352 by the fire-and-CO alarm in my foyer. It wasn't the discreet chirps that mean low battery; it was a full on alarm. I figure this may have had something to do with yesterday's poor air quality, even though I had the windows closed and the HVAC on. That, and I've been a bad girl and not replaced my smoke alarm batteries since I moved in last spring.

So I replaced the battery in that alarm. (Mental note: I have two others, and only one battery left.) About two hours later, the alarm sounded again for about five seconds. It hasn't sounded since.

And I'd been sleeping so soundly. Sheesh.