Contact: David F. Salisbury
Caption: The study found that night nurses used five distinct sleep strategies illustrated by this figure. The schedules cover eight days (A to H). The work shift is shown in dark gray; sleep time is shown in red; and free time is shown in light grey. The bar graph in the lower right shows how poorly adapted the nurses were who followed the different schedules. The night stay strategy was not included because it was used by so few nurses.
Credit: Johnson Laboratory, Vanderbilt University
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Related news release: A sleep strategy commonly used by night nurses throws off their circadian clocks