“Sometimes he did not know if he slept or just thought about sleep.”
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Mark Strand 14
Canadian-American poet, essayist, translator 1934–2014Related quotes
“He sleeps well who knows not that he sleeps ill.”
Maxim 77
Sentences, The Moral Sayings of Publius Syrus, a Roman Slave

Book II, Canto VIII, III The Kiss.
The Angel In The House (1854)

Source: Song lyrics, The Sensual World (1989)
Source: Last and First Men (1930), Chapter I: Balkan Europe; Section 1, “The European War and After” (p. 17)