This morning I woke up when my alarm went off, pressed Snooze, and went back to sleep for another nine minutes. Or so I thought; in fact I'd absentmindedly mistaken Off for Snooze, so when I next woke up thirty-five minutes had zipped by and I was definitely on the late side. I don't remember ever having made this error before.

I think that if I was sleepy enough to get that wrong, it's probably a good thing on balance that I got the extra shut-eye…