I evolved from owls

Whenever I have really important stuff to do the next day, say an exam, for example, I couldn't sleep. I don't even know what important thing I'm going to do tomorrow, but not an inch of me feels sleepy. When I went home after class today, I felt extremely exhausted. I wonder why there isn't a trace of exhaustion which swirled in me a few hours ago. This could only mean one thing: my body clock is screwed. Therefore, I conclude I really am nocturnal.

I feel so stressed out right now. I'm so busy, I don't even have a spare weekend until December, or so I think.