@sbcamp,
What you are experiencing sounds very similar to what I experienced during my first 8-10 weeks. I especially noticed it at night as I was trying to relax and get to sleep. I was told it was related to the healing process, especially that associated with muscles and nerves healing. As new nerve connections are made, it was causing the muscles to twitch which then caused a cascade of activity until I was in a full blown spasm! Only thing I found gave relief was massage or getting up and walking a bit (part of the reason I didn’t get much sleep at night during all those weeks)!
It should get better. I haven’t really had any issues for several weeks now, except for when I overdo things.