My doctor suggested amitriptyline for me for the same reason 1 1/2 years ago. I have never slept better in my life that I can recall - pre and post PD. There have been no side effects. I almost always take half the dossage he recommended, though, one 25 mg pill. When he first started me on it I took two and I felt my heart beating somewhat more rapidly. This doesn't happen with the one pill and I slept soundly.