Why not 2:30 in the afternoon?
At 2:30 this morning, our carbon-dioxide detector started beeping. Nothing was wrong — the reading was still 0 — but the battery was starting to die. I got up, walked downstairs and replaced the batteries.
If only I could have gotten back to sleep.
Grr.
On the plus side, I got to catch up on my email, watch an episode of Firefly and walk on the treadmill. All before 5:00am. So productive!

