Melatonin is for sleep cycle (traveling etc).

If there are any past issues with alcohol as OP has discussed, I would not use Ambien or any other sedative-hypnotics.

__________________
'07 Yukon 2500
'13 Subaru Outback 3.6R
'13 Orbea Carpe 9-speed

Currently Benzless
Formerly: 300TD, S600, E55, 560SEL

---= The forest breathes, listen.
-Native American elder