I've been taking melatonin for the last four nights but I am stopping. I have found myself getting more and more tired the last few days, to the point that I was so exhausted last evening that I didn't even have the energy to type my daily post. Also the last two nights, I have had extremely vivid, freaky dreams. I'm not sure it's from taking the melatonin, but I'm not taking it anymore. I like LeTheVerte's suggestion about nighttime teas.
Congratulations on two weeks (I'm a day behind you) and good luck with the sleep issue!