Caffeine supplementation may impair sleep quality and increase insomnia risk in athletes
This systematic review of 9 randomized controlled trials found that caffeine supplementation can have detrimental effects on sleep parameters such as sleep quality, duration, efficiency, and onset latency in athletes. The effects varied based on timing of consumption, dose, and habitual caffeine use.
This article is automatically generated from the structured evidence profile behind the claim above. Scores reflect the quality and quantity of available research, not clinical advice.
Caffeine supplementation may impair sleep quality and increase insomnia risk in athletes The current body of evidence comprises 1 study, including 1 randomized controlled trial. EvidenceHub rates the overall confidence at 42/100 (low).
The Claim
Caffeine supplementation may impair sleep quality and increase insomnia risk in athletes
This conclusion is most relevant to: Professional athletes (athletic community).
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Does caffeine supplementation affect sleep in athletes? A systematic review of nine randomized controlled trials. (Clinical nutrition ESPEN, 2025) —
How It Works
The proposed biological pathway:
- ▸Caffeine blocks adenosine receptors in the brain
- ▸Reduces sleep pressure and delays sleep onset
- ▸Alters sleep architecture and reduces slow-wave sleep
- ▸Result: Increased sleep onset latency, reduced sleep quality, and higher risk of insomnia
Who Might Benefit
Evidence fit by population:
- ▸Professional athletes (athletic community)
Recommended Dose
N/A
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Only 9 trials were eligible, limiting generalizability
- ▸Variability in study designs (timing, dose, exercise protocols) prevents definitive conclusions
Frequently Asked Questions
Does caffeine always harm sleep in athletes?▼
No, effects vary based on timing, dose, habitual use, and individual sensitivity. Some athletes may not experience significant sleep disruption.
What sleep parameters are most affected by caffeine?▼
Sleep onset latency, sleep quality, sleep efficiency, and number of awakenings are commonly affected, with insomnia being a likely outcome.
How can athletes minimize caffeine's impact on sleep?▼
Athletes should consider individual responses, avoid caffeine close to bedtime, and adjust dose based on habitual use and exercise timing.
Is caffeine supplementation recommended for athletes despite sleep risks?▼
Caffeine may enhance performance, but its detrimental effects on sleep and recovery should be weighed. Personalized supplementation is advised.
References
- 1.Bodur M, Barkell J, Li X, Sajadi Hezaveh Z. “Does caffeine supplementation affect sleep in athletes? A systematic review of nine randomized controlled trials..” Clinical nutrition ESPEN, 2025. PMID: 39551351 DOI: 10.1016/j.clnesp.2024.11.007