And, if by exerting you mean the tense feeling you get in your head when you are, say, lifting something heavy, I sometimes do this a little bit
when I stretch, but
when I am lifting that heavy object
when I am not relaxed, I don't have that problem. It only occurs when I am going from a relaxed to a more awake state. (like daydreaming kind of relaxed, and lower states of consciousness).