Opposing forces on my sleep
Normally, the fact that the sun is only coming up around 7am would make me sleepier and want to sleep longer. On the other hand, this is Hainan. During other times of the year, it is quite warm. Now it is quite a bit cooler, so sleep is not aided by me wanting to stay in bed because it is so comfortably warm.
Now that I need to do work and catch up from being away, I have to burn the midnight oil. And now there is a lot more midnight to accomplish those tasks.