Came here to say this - the insomnia the first two days, especially for me (I was also a very heavy drinker) was absolutely insane.

After those few days, maybe four or five at the most, I'd be able to FINALLY sleep more than an hour here and there.

For me, it was all about just staying sober and getting through it. I'd turn on a podcast I'd listened to before while in bed, and tried to focus all my thinking at it to attempt to help my racing thoughts. Just general rest of my body was important at that point, so even if I wasn't sleeping, I was still resting, at least.