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Effects of caffeine on sleep quality and daytime functioning
Frances O'Callaghan1, Olav Muurlink2,3, Natasha Reid4
1School of Applied Psychology, Griffith Health, Griffith University, Southport, QLD, Australia, f.ocallaghan@griffith.edu.au.
Risk Management and Healthcare Policy
|December 22, 2018
Summary
Caffeine may not directly enhance performance but rather reverses withdrawal symptoms. While research shows a net benefit for habitual users, more studies are needed to understand caffeine
Area of Science:
- Neuroscience
- Pharmacology
- Sleep Science
Background:
- Caffeine is a widely consumed stimulant, with 90% of US adults consuming it daily.
- Caffeine withdrawal causes significant cognitive, emotional, and behavioral deficits.
- The perceived benefits of caffeine may stem from reversing withdrawal effects, not net enhancement.
Purpose of the Study:
- To review the relationship between caffeine consumption and nighttime rest.
- To assess if caffeine reverses performance deficits from sleep deprivation.
- To model the net effect of caffeine on daytime functioning.
Main Methods:
- Integrative literature review.
- Analysis of animal and human studies (habitual and low-dose users).
- Consideration of caffeine-naive populations for future research.
Main Results:
- Caffeine consumption shows positive impacts on physical and cognitive functioning.
- Performance improvements may be due to reversal of caffeine withdrawal.
- Studies on habitual and low-habitual users suggest a net benefit of caffeine.
Conclusions:
- The net effect of caffeine on daytime functioning is complex and influenced by withdrawal reversal.
- Convenience of caffeine offers practical advantages over adequate sleep for performance.
- Further research, especially in caffeine-naive individuals, is crucial for definitive conclusions.
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