The Last Possible Minute

Why is it that I can't seem to do anything until The Last Possible Minute? I wrote a five-page paper for my Ulysses class between the hours of 1 a.m. and 7 a.m. on the day that it was due, two or three weeks ago, and I got an A-. That only serves to encourage this terrible habit, really. I'm sitting here now and it's nearly midnight, and I haven't started my 6-page take-home midterm for HIS261. At least, I'm pretty sure it's 261. Wish me luck?