it was while she was doing this-pulling with her head down and her butt out and both arms wrapped tightly around the bedpost-that she suffered her first bout of lightheartedness ... only as she lay with her weight against the post , looking like a woman who is so drunk and tired that she can only stand up by pretending to dance cheek-to-cheek with her boyfriend , she thought that darkheadedness would probably be a better way to describe it .