"Insomnia is a variant of Tourette's--the waking brain races, sampling the world after the world has turned away, touching it everywhere, refusing to settle, to join the collective nod. The insomniac brain is a sort of conspiracy theorist as well, believing too much in its own paranoiac importance--as though if it were to blink, then doze, the world might be overrun by some encroaching calamity, which its obsessive musings are somehow fending off."
— Jonathan Lethem (Motherless Brooklyn)

"Tourette's is just one big lifetime of tag, really. The world (or my brain---same thing) appoints me it, again and again. So I tag back. Can it do otherwise? If you've ever been it you know the answer."
— Jonathan Lethem (Motherless Brooklyn)