This feels like this article was written in response to this article from Slate Star Codex since this also mentions DSPS: http://slatestarcodex.com/2018/07/10/melatonin-much-more-tha... > I have it fairly bad. My body naturally wants to go to bed around 2 a.m. and rise around 10 a.m. That was my cycle as well and I wouldn't describe it as "fairly bad" it's definitely later but not egregious. The SSC article recommend…
Did you need to use melatonin only for those few weeks that it took to adjust your schedule, or have you had to continue using it indefinitely to maintain this schedule?
"These don’t “cure” the condition permanently; you have to keep doing them every day, or your circadian rhythm will snap back to its natural pattern."
So it looks like you have to take the melatonin on a continuous basis.