Follow-Up: Hello Nightwalker. Have you tried dividing your doses of Carbidopa into two an evening and late night dose? One of the drawbacks of dopaminergic agents is that they do not have a prolonged action time which leads to a "rebound" of symptoms late in the sleep period, leading to poor quality of sleep near morning. The other thing that I was wondering is if you could have another co-existing sleep disorder that is causing your poor sleep? I wish you the best of luck!