Why can't caffeine wake me up like normal people?

I'm sitting next to the suggestive sculpture on the 6th floor Education building, waiting for my financial accounting class to start.

It's 2h45m long, and I'm already struggling to stay awake. Also, my exciting prof is away, and we have a sub. Its not looking very promising for this evening.

Classes kind of swept my feet from under me.

I swear, its still Friday, two weeks ago.