Clonazepam
"I've been taking clonazepam 5 mg to 10mg tablets as needed for anxiety and nerve pain for 4 years now, and also have ADD.  As of lately I've noticed that about an hour after taking clonazepam I felt restless and tense, almost jittery and my muscles tightened up and I was wide awake so I basically got 2 hours of sleep at night.  I would say that after long term use, even if it is as needed, clonazepam definitely causes affects of insomnia and muscle stiffness."