Could be anything. Dehydration, liver function and etc. The only way to know is to see a doctor. I used to also drink myself to sleep and I never slept well. Always waking around 3-4am unable to sleep for a couple hours, then fell into a deep sleep only to have to wake early. Put me in a terrible mood for the day. The sleep I have since quitting is absolute heaven.
I juiced for an entire week after quitting. Lemons, kale, carrots, beets, garlic, ginger, celery...then I broke out on my neck as my body detoxed.
Trust me, your body doesn't want or need the booze.