I still could sleep 10 hours plus if circumstances allow it. :-)
The first months or even the first year of my sobriety I felt exhausted. It was sometimes an overwhelming process. I had periods when I couldn't sleep at all and had my head running all night or I would sleep a lot. The shakes would periodically come back when I hadn't eaten enough or in situations I didn't know how to deal with sober.
It will get better and you have only go through this once.