October is a hellacious month for deadlines. It is mid-semester, so there is grading to do, plus there are many proposal deadlines to hit. Early November is spent catching up on all the things that slid in October. Mid-November, it is the hectic end of class period, plus Thanksgiving planning (for those in the US). The beginning of December is bliss--classes end, so no more lectures. The final exams are written. There are no more proposals due (at least in my field), and service obligations are ending for the year.
My favorite time of the academic year is in early December. This is the time I can actually have great discussions with my grad students, catch up with the manuscripts on my desk, and actually spend some long stretches of time on research. It is like a mini-summer, but feels all the sweeter after the huge Fall proposal rush. Alas, the feeling of relief is all too short before the wind up to start the next semester!