You might have just found a good level. You must have worked really hard to get to this point and now a few hours in the afternoon might be all your body wants

You might have just found a good level. You must have worked really hard to get to this point and now a few hours in the afternoon might be all your body wants to do for good reason. I go through the same writing my PhD literature review. It comes and goes and I've decided to accept it rather than defeat it. When I go through periods of making little PhD progress, I don't hate myself and do something else.