Melatonin Cures

NAY- I have tried Melatonin and I did not find it to be a good alternative for insomnia. Firstly I am on a antidepressant-Lexapro, and I feel like Melatonin really makes my depression worse, and it's effectiveness was inconstant, one time I felt real drowsy and slept good, another time only slept a few hours then woke up again. My boyfriend's Mom also tried it and said it did not work for her either.