Hi tom, i'm epileptic and have full body night dystonia (spasms, jerks and cramps) I smoke all day to control the epilepsy but could do nothing about the dystonia, I have found edibles to be the only way of dealing with the spasms (which are so bad at times they approach turettes type with arms and legs flailing and shouts of pain in my sleep) the dose has to be high enough to effectively induce unconsciousness which can leave me with terrible morning 'weedover' but the easing of the worst symptoms is a relief (if only for my missus who is less likely to get thumped in the night!) I've not found any 'happy medium' but at least i can get relief if i've not got a demanding days work the following day. Hope this helps, happy to discuss further.
jack