Started a new job and spacing out?

Job stress. Try to figure out why. Is there something about this type of work that you don't like? (then, you need to start looking for another) is there some factor at work (eg., harsh supervisor, sexual harrassment, gossipy coworkers, etc.) that really bothers you? Or are you just having an exaggerated stress reaction to a new experience? Wait several weeks to see if it settles out.