Counteracting driver sleepiness: Effects of napping, caffeine, and placebo
- 1 May 1996
- journal article
- clinical trial
- Published by Wiley in Psychophysiology
- Vol. 33 (3), 306-309
- https://doi.org/10.1111/j.1469-8986.1996.tb00428.x
Abstract
Sleepy drivers should "take a break," but the efficacy of feasible additional countermeasures that can be used during the break is unknown. We examined a shorter than 15 min nap, 150 mg of caffeine in coffee, and a coffee placebo, each given randomly across test sessions to 10 sleepy subjects during a 30-min rest period between two 1-hr monotonous early afternoon drives in a car simulator. Caffeine and nap significantly reduced driving impairments, subjective sleepiness, and electroencephalographic (EEG) activity indicating drowsiness. Blink rate was unaffected. Sleep during naps varied, whereas caffeine produced more consistent effects. Subjects acknowledged sleepiness when the EEG indicated drowsiness, and driving impairments were preceded by self-knowledge of sleepiness. Taking just a break proved ineffective.Keywords
This publication has 9 references indexed in Scilit:
- Sleep related vehicle accidentsBMJ, 1995
- Accidents and Sleepiness: a consenesus statement from the International, Conference on Work Hours, Sleepiness and Accidents, Stockholm, 8-10 September 1994Journal of Sleep Research, 1994
- Influence of caffeine on selective attention in well‐rested and fatigued subjectsPsychophysiology, 1994
- The meaning of good sleep: a longitudinal study of polysomnography and subjective sleep qualityJournal of Sleep Research, 1994
- Sleep restriction and SWS‐suppression: effects on daytime alertness and night‐time recoveryJournal of Sleep Research, 1994
- A Field Study of Sleep Disturbance: Effects of Aircraft Noise and Other Factors on 5,742 Nights of Actimetrically Monitored Sleep in a Large Subject SampleSleep, 1994
- Sleepiness in long distance truck driving: an ambulatory EEG study of night drivingErgonomics, 1993
- Subjective and Objective Sleepiness in the Active IndividualInternational Journal of Neuroscience, 1990
- Effects of caffeine on alertness in simulated automobile driving.Journal of Applied Psychology, 1974