" When you're the sane brother of a schizophrenic identical twin, the tricky thing about saving yourself is the blood it leaves on your hands--the little inconvenience of the look-alike corpse at your feet. And if you're into both survival of the fittest and being your brother's keeper--if you've promised your dying mother--then say so long to sleep and hello to the middle of the night. Grab a book or a beer. Get used to Letterman's gap-toothed smile of the absurd, or the view of the bedroom ceiling, or the indifference of random selection. Take it from a godless insomniac. Take it from the uncrazy twin--the guy who beat the biochemical rap. "

― Wally Lamb , I Know This Much Is True