A couple of days ago, I woke up and looked at my clock radio, reading 1:22. That surprised me—I didn't think I'd slept in till well in the afternoon. But it turned out I was just at a funny angle, and couldn't read the top of the first seven-segment digital numeral. It was actually 7:22 a.m., so I went back to sleep and woke up a couple of hours later instead.
Then there was today. My current cancer medication causes somewhat unpredictable intestinal side effects. Last night included some of the worst. I was in the bathroom from midnight until just before 2 a.m., then again from 4 to 6, then up and down every half an hour or so until at least 9:30 a.m. In other words, I had perhaps three hours of sleep before morning.
So, when things had calmed down enough, I feel asleep again. Guess what time I woke up? 1:22 p.m., for real this time.