Tips for falling asleep on a long flight?

Going to be taking a relatively long red eye flight in a couple weeks and am looking for peoples advice on how to fall asleep on the plane lol. I know this question probably seems stupid but I can’t for the life of me ever fall asleep on flights and I don’t want to be feeling miserable when I land . I’ve heard taking melatonin is a decent idea? I’ve never tried it and don’t know if it would even be effective. Regardless, open to any suggestions!