I just took a nap.  That's a false statement.  I just lay in my bed for an hour, drifting in and out of sleep as the light faded from the room.  It was actually rather relaxing.  And now it's well and truly dark outside, and the library we can see from our window has every window lit up, as students sit inside and study.  And now, it is time for me to join them.  Not spatially, but mentally.  Homework time.