Yes, Illinijohn, I've considered the possibility of Restless Leg Syndrome. My muscle twitches (fasciculations) are worse at night when I'm in bed. They prevent me from falling asleep. If I do manage to fall asleep, they wake me up and I cannot fall back asleep. This leads to tiredness and exhaustion during the day.

But they're also present during during the day when I'm resting or sitting down, reading, or watching TV. They aren't noticeable when I'm moving around, walking, gardening, swimming, etc. Movement seems to help. It's when I'm lying still, trying to relax, that they are at their worst. Like you mentioned, it's not just in my legs. They are also frequently in my arms and hands, and sometimes in my torso.

My muscle twitching has been going on for about 2 months now. I'm not noticing any weakness. I only hope that it's the benign form, and not an indication of anything more serious. Thanks for all of the previous replies, which have been helpful.