> Melatonin a half hour before bed has changed my life.
I thought your body habituated to externally-supplied melatonin and it became less effective with time; are you using it only sometimes or did I misunderstand?
I don’t believe this is the case, though it’s worth noting that the doses you typically find at pharmacies are much larger than you actually need. From what I’ve read it’s unlikely to be habit-forming at lower doses and it typically works just as well (if not better) at those doses.
Lots of info here: https://slatestarcodex.com/2018/07/10/melatonin-much-more-th...