Does this happen to you? I had the busiest semester of my young life so far -- two new courses to teach, a big grant deadline, and several papers to go out -- and was generally on top of everything. I was working with energy and intensity.
As soon as the term ended my brain turned to mush. I've got loads of time, and still plenty to do (though nothing immediately pressing), but I can't get organized to do anything.
So much for getting a jump on next semester.