Elavil (amitriptyline) is an older depressant that is used to treat PCS headaches. It can also help with sleep. My daughter didn't use it (though I think would have benefited from it early on - but didn't get prescription until 5 month into it and she was on something else at the time and didn't switch).

I don't have PCS - but have had a hard time falling asleep with all of my daughter's PCS issues. I had been taking Ambien off and on but stopped because I didn't like the side effects when I stopped taking it. I have since found something that knocks me out every night. It's an application that I downloaded on my Android phone (there is an iphone/itouch version too) called "Deep Sleep with Andrew Johnson". It's kind of a guided mediation kind of thing. I listen to it - only half paying attention - and every night - no matter how stressed I am - I fall asleep before it's over. I plan on having my daughter try it as well.