" Sleep is divine but by no means stable; the slightest shock makes it volatile. A friend to habit, it is kept night after night in tis appointed place by habit, more steadfast than itself, protected from any possible disturbance; but if it is displaced, if it is no longer subjugated, it melts away like a vapour. It is like youth and love, never to be recaptured. "

― Marcel Proust , The Captive / The Fugitive (In Search of Lost Time, #5-6)