When I was school aged, I always woke up at the same time (6am) in order to be ready for the school bus and school in general. For the longest time, it didn't matter if I went to bed at 9pm or 2 in the morning, I would always wake up at 6am.

I seem to be picking up that habit again (right down to waking up around 6am), which is nice for the tail end of my sleep schedule. The rest of it... well, I was up several times during the night. If I can get uninterrupted sleep, this regular internal wake-up call will be very much welcome!