Keep going, because another wave will come, or take a break, relax, and come at it in like a half hour or so?
@Spanishguy69 the answer is yes and no to each; it all depends on your objective at the time. You need to be in the mood for a continuation of a session; in fact you need to be in the mood to start your session to begin with. Don't do it just to put in the time, it wont work. If you were in the right mood to start your session and you lost it, continuing is pointless. Your mind has to be in it or you are wasting your time.
Give yourself a chance and take the time to enjoy. Good luck