Because I'm nocturnal

Yeah, this usually happens when there's a social gathering or event that I have to attend in the morning. I'm nocturnal, you see. And I really really can't help it when I'm wide awake in the evening and literally can't force myself to sleep even though everyone else is in the house. Since attendance is usually a must in these types of events, I just try to sneak in a nap for an hour if I can right before sunrise. Or just pump myself with enough caffeine to stay awake for the next 8 to 12 hours. And without fail, I will already be nodding off as we're on our way home.

And the last time I was legitimately awake for more than 24 hours without power naps in between was back when I cramming to finish 3 assignments in one week (3 days) right before the deadlines.