I think like any new med, we need to be cautious with this. Several medications have effects that are only discovered after its been released to the public
I haven't used it much, but I am considering trying it in patients who fit the right profile for it..e.g. they need a med that will last through the night, or perhaps they have a circadian related sleep disorder.
Further I would consider it (though with a grain of salt) for those who may benefit from the effects of melatonin which do not involve sleep. Unfortunately many of these benefits are not on the order where standard of care suggests melatonin for use. E.g. protection from radiation, benefits in perimenopausal women, etc.