Rumor has it that Serotonin takes a hit from PD as well. I am an a low dose SSRI for anxiety. I have read that Serotonin regulates our daily circadian rhythm so this can explain in part the lack of sleep.
I posted on this at length, so I am attaching the link to the thread. I blather on at length as usual so go right past to the good stuff by Mrs. D. There is a more natural treatment than SSRI. I plan to start weaning off the hard stuff next month and trying out her recommendation.
http://neurotalk.psychcentral.com/sh...ight=serotonin
Best,
Laura