Absolutely but I'm glad you asked this question, because the pain in my legs is the worst today that it's ever been.  I've had it for quite some time (diagnosed in '03).  Sometimes it seems to start in the knee and radiates downward so calf, shins, top and bottom of feet, ankles are all affected.  Sometimes it seems to start in the feet and work it's way up, into my lower back.  I was walking every day, as well as stretching (have also tried yoga), but the relief is short-lived regardless.  I too have most problems (until today) when trying to sleep and sometimes elevate my legs on a pillow.  But I doubt this is what's known as the spasicity of MS because it doesn't feel like spasms.  The only way I can describe it is the deepest, throbbing but constant, pain (maybe like a rubber band through your legs that is far too tight?) or that it must feel like pain that someone with bone cancer feels.  I never know if I should do heat or cold to relieve symptoms.  Good luck with yours.