I started a new job as a substitute Rural Mail Carrier. Usually, this would mean one or two days a month, perhaps the occasional couple of hours on dedicated tasks. Instead, the carrier I substitute for went on vacation for three weeks while I was still finishing the inital training. So a task that takes her about six hours a day was taking me closer to ten or eleven hours. The job is both physically and mentally demanding, and I spent most of the last four weeks limping home and falling asleep.
Now that she's back, I'm not even on the schedule - so I can start catching up on the many many things I expected to do in the evenings, only to lapse into unconsiousness.
My new sleep pattern is 1) fall asleep before 9 PM, 2) wake up restless at 1 AM, 3) putter about uselessly until 3 AM, 4) fall asleep again until the alarm goes off at 5 AM. I plan to now follow that with 5) go back to sleep after dropping the Kid off at school.