hi there, i called my neuro complaining with this. i described it differently. it feels to me like the muscles are locked as tight as they will go. its the most severe muscle cramps i have ever had. he is checking me for ms, but i don't have a diagnosis yet. he did find a severe b12 deficiency tho. he also called it RLS. he started me on Requip, but i can't tell that it is helping at all. the problem isnt only at night. it is all day long. he said that it was due to he b12 deficiency. but in reading up on ms, it could be the spasticity thing, i guess, if it ends up that i have ms. just thought id pipe in and say hi and give my experiense.