so much so that it soon became the case that whenever even the most formidable of manservant arose from his bed after another night of tossing and turning and longing for dreams of his own demise , a tightness was sure to form in his chest : his master did not even have to be present for this to occur , for the mere anticipation of sharing the space his master occupied , of breathing the same air his master breathed became , on its own , an ineradicable source of fear .