"i have parkinson&#039;s, which often has insomnia as a symptom.  sometimes i could not get any sleep at all for three or four nights. true. i tried zopiclone which gave me four hours sleep at doses of 7.5mg, but i felt yucky next day.  my gp recommended 30mg of amitriptyline per night which generally gives me five hours sleep and i feel ok the next day. this is a wonderful medicine which has improved my life."