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The two-process model of sleep. Panel A (Top) represents the homeostatic and circadian processes in a day working nurse. Panel B (Middle) shows these same processes for a night shift nurse without a nap who retires upon arriving home at 8 AM, goes to sleep at 8:30 AM and wakes at 1 PM. Panel C (Bottom) shows these same processes with a 30 minute nap taken at 3:30 AM.
Artwork by Joanne Pinna, M.S.
