Sleeping is a challenge with PD.
I take Propanalol and melatonin. Helps me fall asleep but I don’t stay asleep! I wake up after about four hours.
I take Amitriptyline for sleep. I lay awake for a long time after I lay down. My mind going full on thinking about things. I finally fall asleep for a short period. I do that all night. I wake up so tire. I'm going to see if my doc can give me something else.
I’ve read, and experienced it myself, that it is a symptom. I don’t know if that’s the only reason you may have trouble but it’s possible. I would check with my doctor if it’s too troublesome. One of my doctors has prescribed me a medication to help me sleep Trazadone 100 mg). Non-addictive and helps.