Maybe the "recumbent position" is the cause of my spasms and jerking in my low back and legs when I am in bed. But it I stretch ( a lot) before bedtime, this happens less, much less, I must say.
I used to have more parathesias after exercise, but since I have become more active lately, the parathesias (tingling, burning) are less, much less. What happened to cause me to be more active is this. I am having tooth trouble and this has caused eating to be less of a good time for me, therefore I automatically cut back on portions. I lost 11 pounds in the past two months, gradually. My ankle swelling ceased. I feel lighter and easier to move. So I have been more active. Only my erythromelalgia in my feet holds me back from exercising more. But I realize there is a limit to this spurt. If I had no foot pain and walked for miles, well, I'd be in the same situation some of you are, weak and then stiff and then in spasm. So it's all a matter of building up and knowing how far you can push it. I was a dancer in my youth, very athletic, so what I am doing now is nothing compared to that.

I edited this post to re-emphasize how important stretching is. I got my stretches from several sources, several PT's over the years and several chiropractors. I have increased my arm and hand strength by self-massaging the stubborn knots in my legs, a never-ending task.