Not getting enough sleep results in people losing focus (but you mentioned you addressed this).

Also, is your lack of focus really just procrastination?

According to pg:

"If your work is not your favorite thing to do, you'll have terrible problems with procrastination. You'll have to force yourself to work, and when you resort to that the results are distinctly inferior."

http://www.paulgraham.com/love.html

Another theory I like: procrastinators are perfectionists and are worried about disappointing themselves or are dreading the goal of perfection.

Anyhow... back to work.