“ A man who drops into his bed each evening like a dead weight and lives again only at the moment of coming awake and getting up, will that man ever dream of making, if not great discoveries, then at least some minor observations, concerning sleep? He hardly knows whether he sleeps. A spot of insomnia is not without its uses for appreciating sleep, for projecting a certain light into that darkness. ”
 Marcel Proust, Sodom and Gomorrah (1921). copy citation