Later: I went to bed around 1:00 a.m., I think, and probably conked out at 1:30 a.m. I woke at 4-something a.m. for no apparent reason. I ended up staying up for no good reason. I had another quiet day, but that was okay. I got a good bit of laundry done, so that was something productive.
I sorted free e-books into my to-be-read files.