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  • Title: A pilot study investigating the impact of a caffeine-nap on alertness during a simulated night shift.
    Author: Centofanti S, Banks S, Coussens S, Gray D, Munro E, Nielsen J, Dorrian J.
    Journal: Chronobiol Int; 2020; 37(9-10):1469-1473. PubMed ID: 32819191.
    Abstract:
    Consuming coffee immediately prior to a nap, known as a caffeine-nap, has been shown to improve alertness during the day, but it is unknown whether a caffeine-nap is effective at reducing sleep inertia during the night. A simulated shiftwork cross-over laboratory study was conducted whereby participants (N = 6, 4 F, 21-36y) consumed 200 mg of caffeine, or decaffeinated coffee (placebo), immediately prior to a 30 min nap opportunity at 03:30 h. Compared to placebo, the caffeine-nap resulted in improved vigilant attention and subjective fatigue in the 45 min post-nap opportunity. The caffeine-nap may be useful in reducing sleep inertia in shift workers who nap on nightshift.
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