Late night thoughts

Where did my confidence go? When I was an undergrad, I used to take pride in how late I would stay up studying. Now, all I can think of is how sleep-deprived I'm going to be for the next few days. Back then, I used to say things like, "I'm gonna kick that exam's ass!" Now, it's more like, "Please, oh please, be nice to me!" I felt like such a bad-ass as an undergrad, failure never crossed my mind. What happened? That is one thing I didn't want to grow out of!