Laboratory and field studies of naps and caffeine as practical countermeasures for sleep-wake problems associated with night work.

ABSTRACT

STUDY OBJECTIVES: To evaluate the effects of napping, caffeine, and napping plus caffeine on performance and alertness in both laboratory and field settings. DESIGN: (1) Laboratory Study parallel-groups design with random assignment to 1 of 4 experimental conditions. (2) Field Study crossover design. SETTING: Sleep laboratory and field settings. PARTICIPANTS: (1) Laboratory Study 68 healthy individuals; (2) Field Study 53 shiftworkers who worked nights or rotating shifts. INTERVENTIONS: (1) Laboratory Study an evening nap opportunity before the first 2 of 4 consecutive simulated night shifts plus placebo taken all 4 nights, caffeine taken nightly, the combination of the nap and caffeine conditions, or placebo. (2) Field Study an evening nap on the first 2 of 4 consecutive night shifts plus caffeine taken nightly versus placebo taken nightly without naps. MEASUREMENTS AND RESULTS: (1) Laboratory Study Napping, caffeine, and their combination all improved alertness and performance as measured by Maintenance of Wakefulness Test and Psychomotor Vigilance Task, but the combination of napping and caffeine was best in improving alertness. (2) Field Study Napping plus caffeine improved performance as measured by Psychomotor Vigilance Test and decreased subjective sleepiness in individuals working the night shift. CONCLUSIONS: Napping plus caffeine helps improve performance and alertness of night-shift workers.