Thanks CG. I will continue to try on the sleep schedule and beer ("There is no try. Either do, or do not").
You don't say how long or intense the sessions are. But, there is a good chance you are overtraining. Three times a week training is sufficient for general health. The other four days you should try to do something light like a 30-minute stroll each day. If you work at a desk, try to stand frequently, walk to the water cooler, do some stretches, etc.
With training, less is often better. I believe you are in your mid-fifties. Things have changed. Overtraining can cause a general fatigue or worse.
I am 55. But I need to do the cardio daily to help mitigate my daily anxiety. When I say "anxiety", it's not exactly worry over things - it's a physical jitteriness like I drank 3 pots of coffee (I no longer drink coffee). And then of course, I worry about *that*. 30 minutes on a StairMaster - I can do it with my back and leg issues because bent over, no pain. Sometimes a recumbent bike. If I walk 5 minutes - pain (straight up; not bent over). Failed back surgery from 2008.
long-standing back problem
Any chance this is interfering with good sleep?
Very possibly - hard for me to be sure. But pain meds have their own issues.