A case of the Mondays - The feeling you get when you come back from a fun weekend an

The feeling you get when you come back from a fun weekend and your job is waiting to punch you in the face.

My mom said she had the Mondays because her boss gave her a new project on Monday.

I got a case of the Mondays because I had to go to work after a weekend of pizza and video games.

My dad said he had the Mondays because he had to get up at 6 AM again.