Kat is esentially right in her definition. Dystonia is writhing movements and painful almost constant spasms in the affected limbs. I have dystonic postures in all four limbs, unfortunately. Dystonia can affect sleep, movement, postures, the tightness of limbs. A GREAT WEBSITE TO GO TO TO FIND OUT MORE ABOUT IT IS: http://www.wemove.org/dys_pat.html Hope this helps. Jenn