@jfw777
Here is an update on dealing with my leg cramps. Today is Monday. On Saturday I committed to doing the following every day. Some of these I have done off and on over the years and have gotten at least temporary relief.
1. I am wearing compression socks for at least half the day (see my post above about wearing them while standing all day)
2. I am taking 2 magnesium oxide at noontime and one at bedtime (that is a change from magnesium glycinate)
3. Take a 15-20 minute walk outside
4. I downloaded an app called Hourly Chime. Every hour from 8am to 8pm it 'bongs,' which is a reminder for me to get up and get moving! That includes calf raises, calf stretches, shin stretches, etc etc. I can sit for hours at a time, easily. I think this is the best thing I have committed to doing.
5. I began taking R-ALA about 2 weeks ago. I take 600 mg at noon (other people take much more than that; I'm starting out slowly)
6. I have a salve that contains a bunch of natural ingredients like beeswax, arnica, vitamin E, cinnamon. It also has magnesium, lidocaine, CBD, and THC. I rub that into my shins, calves, and feet at bedtime. I have no idea if the CBD and THC help at all; it could just be the good massage that I do, or it could be the lidocaine and magnesium. There are OTC products with lidocaine in them. Menthol may help also.

I have not had even a hint of leg cramps for the last two nights, so I am extremely hopeful that this will continue. I wish I didn't have to pay so much attention to this every day, but getting a good night's sleep is worth it.

Regarding using electrolyte powder, I've tried that, too. My doctor indicated that we really don't need it unless we're sweating (which you may be sweating at night if your room gets too warm, and you may not realize it). Also, someone told me once that you can lose sodium by drinking TOO much water. I have found that to be true.

Thank you to everyone who has offered suggestions. I hope that what I'm offering here can be of help to someone.