Why don't you smell when you're sleeping?

the long version

"Enjoy this latest compendium of fantastic facts from the king of trivia! Did you know... That a "zyzzyx" is a type of wasp? That the chances of being injured by a toilet seat at some point in your life are reckoned to be one in 6.500? That the collective noun for giraffes is the very apt a "tower of giraffes?" And that snail races start with the words "ready, steady, SLOW!" Amaze your friends and fascinate your family with these brilliant facts, and more!" --Publisher description.