Is it possible to suffer from code withdrawal?

I ask this because as I sit in another industrial mechanic theory class I'm zoning out thinking about all the programming I could be learning now.

I kind of feel weak and stressed that I'm not at a terminal right now. Especially after I'll be going straight to work after my classes and that means I'll be away longer.

The keyboard is calling and I'm not there, does anyone have advice for this type of experience?