" When the sun was set I might perhaps go to sleep. I never let myself sleep during the day. Daytime sleep is a cursed slumber from which one wakes in despair. The sun will not tolerate it. If he can he will pry under your eyelids and prise them apart; and if you hang black curtains at your windows he will lay siege to your room until it is so stifling that at last you stagger with staring eyes to the window and tear back the curtains to see that most terrible of sights, the broad daylight outside a room where you have been sleeping. "

― Iris Murdoch , Under the Net