because if they miss , that person standing over you , watching you fall into the dream , if they miss , even by a moment , half a moment , or just a breath , then you 're stuck , and your husband never turns around and you never know if he made it , or your mother stays sunk in her coma with you anchored bedside worrying , or you stare at that bedroom door forever , knob trembling , wondering what 's about to come in .