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- Title
Suppression of sleepiness in drivers: combination of caffeine with a short nap.
- Authors
Reyner, L A; Horne, J A
- Abstract
Previous research has shown that caffeine and a < 15-min nap effectively and separately reduce sleepiness in drivers for 1 hr. In the present study, we examined in 12 sleepy individuals the treatments combined, taken during a 30-min break, prior to a longer (2 hr) continuous monotonous afternoon drive in a car simulator. Nonnap comparisons were 200 mg caffeine only and placebo. For placebo, driving incidents, subjective and electroencephalographic measures of sleepiness all reflected a mid-afternoon peak. This peak was significantly reduced by caffeine and eliminated by the combined treatment, which reduced incidents to 9% of placebo levels versus 34% of placebo levels for caffeine alone. Naps comprising "nonsleep dozing" were still effective.
- Publication
Psychophysiology, 1997, Vol 34, Issue 6, p721
- ISSN
0048-5772
- Publication type
Journal Article
- DOI
10.1111/j.1469-8986.1997.tb02148.x