you want like 0.5mg melatonin at most, 0.3 ideally; more will work no better but will desensitise your MT receptors
i can name this tune in ... three more tweets
MTNR1x: p simple, sensitivity dominated by autoreceptor output
so, if you're doing nightly 4 mg, you'll sleep fine, then be ugh/"off" (how & how much is mostly a function of how in-tune w/yourself you are) for mainly 2 or 3 days, and then it's ~cal'd for 4 mg
I do "office hours", + endo consults by appt if it's that kind of thing, or if it's simple enough to just answer in DM of course I will. Also if it's less simple but I like you and/or the problem