The time at university I was kind of burned out all the time.
I was far away from being a hard-working student, I needed more than double time to finish, but I constantly had a feeling of being stressed.
My free time never felt like free time because I thought I should learn/do something for the university.
Now at work, I can spend my free time without feeling guilty. Sure, I also have to think about problems at work sometime and I still should learn something to get better, but now I can focus on stuff I'm really interested in.