Not sure who initiated this, but I used to have terrible leg spasms. Range of motion does help me, but I discovered that a large part of my spasms are due to the tightening of my Achilles tendons.
It might benefit you to have someone slowly stretch your foot toward your chest. Tell them to be careful not to do it in a jerky manner, but to slowly apply pressure to the base of your foot for about 30 seconds to one minute. I try to have this done two times a day and it really does help minimize my leg spasms. Of course, I have terrible body spasms (that's what I used to use the label spastic whenever I was on the Internet) which can only be controlled by quite a bit of medication. By stretching the Achilles I have been able to minimize some of the medication, but it is a must for me. Hope this helps some. Quadius
