I started with the double whammy of quitting alcohol and going cold turkey off of Ambien. After a few days of not sleeping, what really turned things around for me was a combo of adding L-Tryptophan to my pre-bed supplements, and working on getting my blood pressure down naturally. The L-Tryptophan supplement helped balance out my amino acids and quiets my brain to stay asleep. And for my blood pressure, I have been exercising more, taking a potassium supplement, and eating at least five or six stalks of raw celery every day.
Another thing to consider is that if you have just recently quit drinking, your body is used to all of that sugar from the drink being in your system. You could be slightly hypoglycemic overnight. Eating a small portion of dried fruit before bed can help keep your blood sugar stable overnight.