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  • Title: No first night shift effect observed following a nocturnal main sleep and a prophylactic 1-h afternoon nap.
    Author: Kosmadopoulos A, Zhou X, Roach GD, Darwent D, Sargent C.
    Journal: Chronobiol Int; 2016; 33(6):716-20. PubMed ID: 27077691.
    Abstract:
    Neurobehavioural impairment on the first night shift is often greater than on subsequent night shifts due to extended wakefulness. The aim of the study was to determine whether a 1-h afternoon nap prior to the first night shift is sufficient to produce neurobehavioural performance at levels comparable to the second night shift. Twelve male volunteers (mean age 22.9 years) participated in a laboratory protocol that simulated two 12-h night shifts. A nap preceded the first shift and a 7-h daytime sleep was scheduled between shifts. Neurobehavioural performance and subjective sleepiness measured across each night did not significantly differ between first and second shifts.
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