Journal Article Sleep And Wakefulness As Alternating Phases in the Cycle of Existence Get access Sleep And Wakefulness As Alternating Phases In The Cycle Of Existence. By Nathaniel Kleitman, Department of Physiology, The University of Chicago, Chicago. Cloth. Price, $5.00. Pp. 638, with 33 illustrations. Chicago, Illinois: University of Chicago Press, 1939. Physical Therapy, Volume 20, Issue 1, January-February 1940, Pages 60–61, https://doi.org/10.1093/ptj/20.1.60c Published: 01 January 1940
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