A short, finished list rather than an endless feed: 19 of the best good night quotes ever written, picked out of the full good night archive on QuoteForever. You will find Roy Orbison, Mary Wollstonecraft, Amy Poehler and Nicholas Sparks among them.
Read the list top to bottom, or use it as a starting point - every author name links to everything else they said, and every quote has its own page you can share or turn into an image.