Congrats on day 12. Lots of good advise here... make sure you have a plan. I would also be careful on surrounding yourself with people who do a lot of drinking early on. You need to give yourself the best chance to get through the early days. I had to limit who I hung around with and didn't go to places that would trigger my AV any more than usual.
Your sleeping patterns should get better as time goes on. It's just your body's way of adjusting.
Great job on 12 days! Keep up the good work.