Been away on vacation and just catching up on my old mailbox entries. Ive been reading with interest the mail on this subject. One year ago, I was falling dozing off almost all the time. I was on holiday in Spain and visited an older european internist NOT a PD specialist. He recommended an intense VITAMINE B program. IT WORKED AND IVE BEEN ON IT EVERY OTHER DAY FOR THE PAST YEAR. 5000 MCG B12 50 MG B6 100 MG B1 Now I nod off only when im a car passenger. Cant sleep on planes or trains. Hope this helps someone....