First off Welcome aboard
@Pacifico 
,you've stumbled on probably the nicest place on the Net

I've been a nightly beer drinker for a long time and have been ramping down the % slowly to abate "the Horrors" as much as possible (I brew my own). I can totally relate to what you're saying and heading that way too. I was a Tradesman since I left school so the Arvo beers became a daily ritual and coming form a small town,I fell into the Friday/Saturday night binge thing....looking back it wasn't as "cool" as I thought it was
Yup what
@kavadude said mate, spot on.
Some nights I can get to sleep no probs(usually from exhaustion) but being so used to having Alc in my system at night(and W'Ding from Benzo's), if I haven't had a drink or my "quota" then I inevitably awaken in sweats and "The Horrors". I don't get drunk these days but I have a few every night. At low doses(1 or 2 standard's), Alcohol can have a relaxing effect but becomes a stimulant after a few more and delays the onset of REM. REM is a crucial factor for Optimum Mental Health too....well it's crucial for the whole body and brain functioning. I have naps these days recovering from dose drops to let my body repair and fall straight into REM every time. I slept for 6hours today and it seemed I dreamt the whole time.
Melatonin as you probably know is a Hormone which is switched by daylight directly from Serotonin which is made from Tryptophan in basic terms. UV therapy can help too as there are "light receptors" on the back of the knees. I've read many good reports with that too.
Supplemental Melatonin isn't a sleeping tablet per se' but it helps restore the Circadian Rhythm. Most people who travel OS a lot know and use it to reset from Jetlag. Most people only require a small amount in the 2-5mg range to trigger the response,after that the mg's don't really do much so play around to find the lowest effective dose. It's best taken about 20mins before bed,you won't necessarily feel tired though, but that's when you go lay down.
Alcohol is also a Circadian interrupter so I'm glad you're wanting to remove it like me(besides the other negative health effects).
Like
@kavadude asked, what medication is your wife on?
The heightened anxiety and crippling hangovers are more likely to do with mixing Alc with the med's, possibly a dash of reactive hypoglycaemia.
I know first hand from my time on Xanax, that Alc and Xanax like to party DANGEROUSLY well....one reeeally bad recipe.
Here's to your new start mate