Thanks for all the advice...when this type of spasm hits, the legs are locked, and I can't straighten them. I just have to ride it out, I guess. I did have a large pillow under my legs...and I was pushing against the end of the futon we were on...but it just got the better of me before I could react.
Last night it was the calves that got spastic, but not as severe...I could ride it out...
I see the neuro in a week, and will ask him what up with this?