supplemental melatonin can really mess up your natural sleeping rythm. may find yourself tired at inappropriate times, groggy in the korning.
I took it for years before realizing it’s better to get a thorough workout and just eat once in the afternoon, avoid sugar, stop drinking caffeine if you must have it about like 10am.
i was recommended red light after dusk and I have found that very relaxing, better than melatonin
if you use nicotine you have to just accept the poor sleep tradeoff
limit screentime after dusk