I had thought that unless there was some medical issue (AsD, in particular), that your should never take melatonin for more than three nights in a row because it would mess with your body's production of it.
I've heard this too, which is why we've never used it.
My daughter has issues falling asleep - she will read or draw for hours. It's better during the school year because she's forced to wake up earlier, but during the summer she almost switches completely to a "graveyard shift" unless I'm proactive about waking her up in the mornings. So that's what I do... I wake her up early.
Anyway... no melatonin in this house.
