Melatonin is just a very small part of all the variables involved in sleep. If you are excited or stressed you'll have high levels of adrenaline, cortisone, or cortisol. Diet will affect levels of ghrelin, leptin and insulin. Low testosterone levels, or antidiuretic hormones, can be found in many people. All these things will affect your sleep just as much, if not more, then melatonin does.

The glasses are $8 most places ... which is also cheap. FWIW, my friend was also taking melatonin but it was not effective against her hypomania-driven insomnia.

And magnesium, right?

Doesn't always work.