As a user of this whose primary problem is frequent waking at night rather than falling asleep, I don't find it that helpful. It does help falling asleep, but it doesn't help one stay asleep.
I've spoken with my sleep doctor about this and apparently basically the only thing that's good for helping somebody stay asleep as opposed to fall asleep is a common date rape drug so it's not commonly prescribed.
It's also used for opioid abuse disorders. Truly a miracle drug.