Just thought i would chime in on this issue. I havent been able to sleep since 2009 when i was in a car accident and was injured. Then in 2010 had spine surgery and ended up with crps II. It's painful to lay down. Weird sensations in my legs, burning pains, electrical shocks, non stop. How can i have burning pain yet ice cold toes? So i have been taking sleeping medication every night for years. New doctor put me on extended release gabapanten which helps and has the added benefit of making me drowsy at night, then i take a muscle relaxer to help with muscle spasms from the searing pain. So I'm not taking the sleeping med for now. Anyway, i do get the limb twitches, arms jerks, even my abdomen will suddenly spasm .just a part of this whole crps thing i guess. I cant imagine just falling to sleep and resting like a baby.