Getting my degree in university, I've had a feeling like this during every exam season. At first you have tunnel vision and a clear goal and you study for hours

Getting my degree in university, I've had a feeling like this during every exam season. At first you have tunnel vision and a clear goal and you study for hours everyday for your exams. Once they are over, it's like there's a weird purposeless feeling. To me it felt like I didn't know what to do with myself because all I had done before was studying so hard. I felt like I didn't know what to do for fun or what I even did in my free time before the exam season. Obviously I'm exaggerating a bit and after a few days or so that feeling wears off. But it is a taste of how it may feel after getting the degree.