Somnus lets her poppies fall most plentifully on those having a cool head, an empty stomach, tired muscles, a quiet conscience, and warm feet. – Author unknown, quoted by Rachel Brooks Gleason, “Sleep,” 1867

Oh Sleep! it is a gentle thing, beloved from pole to pole, to Mary Queen the praise be given! She sent the gentle sleep from Heaven, that slid into my soul. – Samuel Taylor Coleridge

There are twelve hours in the day, and above fifty in the night. – Marie de Rabutin-Chantal

[S]leep, and enough of it, is the prime necessity. Enough exercise, and good food and enough, are other necessities. But sleep—good sleep, and enough of it—this is a necessity without which you cannot have the exercise of use, nor the food. – Edward Everett Hale, “How to Get the Best of It,” c.1892