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Continue to ChatUncontrolled or covert napping, however, is still probably very common. One need only move through a building surreptitiously and peek at people to find some subset of sleep at any given time. - David F. Dinges from https://whatsmyquote.com/quote/uncontrolled-or-covert-napping-however-is-still-probably-very-common-one-need-only-move-through-a-building