What's the Difference?

I don't know what is up with me this semester. The past several semesters, I have been on top of all of my assignments making sure that I turn in the assignments way before the due date.  I make sure that I read all that is required and now what is expected.

This Semester, I am procrastinating until the last possible minute, I turned in an assignment late; which I never had before; and just have a "Blah" attitude.

Could it be because I am not taking as many hours as I normally due this semester? Is it because at work I am not sponsoring anything (first time in 16 years) and just go with the flow?  Is it because I just had my surgery and just want to sleep it off?   Is it because I am not walking in the mornings, which would give me the energy I needed for that day?

I don't know?  It just feels different and I don't know why?  But I need to slap out if and get back in track!