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Related Experiment Video

Updated: Jul 10, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Caffeine: sleep and daytime sleepiness.

Timothy Roehrs¹, Thomas Roth

¹Sleep Disorders and Research Center, Henry Ford Hospital, 2799 W Grand Blvd, CFP-3, Detroit, MI 48202, USA. taroehrs@aol.com

Sleep Medicine Reviews

|October 24, 2007

Summary

Caffeine use disrupts sleep and causes daytime sleepiness, especially with regular consumption. Its performance benefits may only counteract sleep deprivation effects, not enhance baseline function.

Area of Science:

Neuroscience
Sleep Science
Pharmacology

Background:

Caffeine is a widely consumed psychoactive substance with significant impacts on sleep and wakefulness.
Laboratory studies confirm caffeine's sleep-disruptive effects and its ability to enhance alertness under specific conditions like sleep deprivation.

Purpose of the Study:

To evaluate the true effects of caffeine on performance and alertness under habitual sleep conditions.
To investigate the relationship between regular caffeine consumption, sleep quality, and daytime sleepiness.

Main Methods:

Review of laboratory and large-scale population-based studies on caffeine's effects.
Analysis of data concerning caffeine intake, sleep patterns, and performance metrics.

Main Results:

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Last Updated: Jul 10, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

Published on: April 7, 2020

Polygraphic Recording Procedure for Measuring Sleep in Mice

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Published on: January 25, 2016

Caffeine primarily restores performance degraded by sleepiness, rather than enhancing baseline function in habitual sleep.
Regular daily caffeine intake, even at low doses, is linked to disturbed sleep and increased daytime sleepiness.
Children and adolescents also experience sleep disturbances and daytime sleepiness associated with caffeine use.

Conclusions:

The performance-enhancing effects of caffeine are often a reversal of sleepiness-induced deficits.
Caffeine dependence can develop quickly, and its risks to sleep and alertness are underestimated by the public and medical professionals.