I've found melatonin best used not on a regular basis, but on nights you know it will take extra time to get to sleep, or when you have to wake early. Its more about keeping your sleep schedule in check.

"Conservatively, a bottle of melatonin pills will cost about 6 USD for 150 pills". This is the part I find interesting. I live in NZ, and melatonin isn't readily available - unlike most drugs here it's not government subsidized. It costs $20 for 10 pills, and you have to visit a doctor.

Crazy accessibility and cost difference.