Later: I actually did go to bed soon, and got a good night's sleep. I was getting worried because I hadn't been able to sleep at night for a couple of days. I think at least a large part of my problem the couple of nights previously was eating tiramisu late at night when I have no caffeine tolerance.
I got to Walmart in the afternoon. It was a very productive trip. I found almost everything I wanted, except for things that they've had a very hard time keeping in stock, like the "milk and honey" liquid soap that I like.