Why do I get sick on weekends?

This is all I have seen for the past week and all I'm going to see for the following two:

The UPF library

I will have my first exam in 10 days and, this weekend, that I wanted to take it easy going out a little bit, I got sick and I can't go out. I hate that!

Have I done something wrong?

I can't wait for Easter holidays to arrive! I will do nothing! I really need a break...

Anyway, I'm gonna go back to my books.

Have a great weekend everyone!