Hi
My dad is late stage PSP sufferer - for some time he has been suffering from what seems to be cramps in his legs - he crosses them and sometimes kicks them violently while convulsing all over - it's very painful to watch
I tried massaging his legs but he wouldn't let me touch them so one time I tried turning him on his side (also called recovery position: en.wikipedia.org/wiki/Recov... - and put a light pillow underneath his extended/bent knee and almost immediately he stopped kicking and went off to sleep
This works 8/10 times - if it doesn't work on one side, I turn him on the other side and it almost always works
So, in case you come across this with your patient, this may be useful