Unfortunately... yes, it can be tough getting to sleep after quitting drinking. You have been adding all sorts of chemicals including alcohol into your system for a long time. Its going to take a while to re adjust.
A great read to help you understand whats going on is:\
http://www.soberrecovery.com/forums/...influence.html (Excerpts from "Under The Influence")
It may just help you sleep ;-)
Congrats on your decision to have a new life.
Take Care,
NB