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Ida, I found your description of the differences between emotion (arousal) and activation interesting. What you say about activation (i.e, "I don't know what exactly the > consequences of "activation" are for the symptoms of PD. An influence > might exist because acetylcholine is an antagonist of dopamine. They > inhibit each other. When the brain uses more aceltylcholine it might be > that dopamine is less inhibited and so the symptoms reduced") may, indeed, explain why self-conscious activity (i.e., thinking about moving) may help someone overcome a PD symptom. Now, what about sleep. What is it about sleep that stop some people's tremors? Debbie White [log in to unmask]