Caffeine Sleep Randomized Trial: What the Evidence Says

Quick Answer

Caffeine Sleep Randomized Trial has 2 source documents in the current Migaku evidence database. The strongest available sources in this first pass are randomized trial, so conclusions should be framed as evidence-aware guidance rather than medical advice.

Key Takeaways

• This page is generated only from sources stored in the Migaku evidence knowledge base.
• Current evidence mix: 1 randomized trial, 1 research article.
• Claims should be interpreted with the source type, study design, population, and publication date in mind.
• This article is educational and does not replace care from a qualified clinician.

Evidence Map

What The Sources Report

• The 2018 International Olympic Committee (IOC) reported that caffeine is among the five nutritional supplements whose positive effects on athletic performance are supported by scientific evidence. [Bingol Diedhiou Azize (2026); evidence level 2]
• Caffeine is metabolized by the CYP1A2 enzyme, which is found in the liver and is responsible for approximately 95% of the cytochrome P450 family. [Bingol Diedhiou Azize (2026); evidence level 2]
• Its production follows the light-dark cycle, resulting in an increased production at night and a decreased production during the day. [Mahdi Nourhène (2026); evidence level 4]
• Supplementation improved both sleep quantity and quality during the subsequent night and enhanced physical performance the following morning, including vertical and horizontal jumps (VJs, HJs) and handgrip strength (HG), and the five-jump test (5-JT) was improved. [Mahdi Nourhène (2026); evidence level 4]

How To Read This Evidence

Evidence level 1 generally reflects systematic reviews or meta-analyses. Level 2 includes randomized trials, guidelines, or public-health guidance. Level 3 usually reflects observational or narrative-review evidence. Level 4 is weaker or early-stage evidence. The level is a sorting aid, not a final quality grade.

Practical Interpretation

There is trial evidence in the current set, but population and intervention details still matter. For caffeine sleep randomized trial, the next editorial step is to add more targeted sources and separate strong findings from early or indirect evidence.

Limits Of This First Pass

This is a small-batch MVP article. It uses the first ingested sources for this topic and should be expanded with more targeted searches, license review, and human editorial checks before being treated as a definitive review.

References

• Bingol Diedhiou Azize (2026). Comparative effects of caffeine and paraxanthine on rowing performance and sleep quality: a randomized crossover study. DOI: 10.1080/15502783.2026.2650339. PMCID: PMC13045172. PMID: 41918248. License: CC BY 4.0. https://pmc.ncbi.nlm.nih.gov/articles/PMC13045172/
• Mahdi Nourhène (2026). Melatonin, Caffeine, or Their Combination: Effects on Sleep, Performance, Perceived Exertion in a Placebo-Controlled Crossover Study. DOI: 10.3390/nu18091425. PMCID: PMC13165432. PMID: 42124027. License: CC BY 4.0. https://pmc.ncbi.nlm.nih.gov/articles/PMC13165432/

Safety Note

Health information can change, and individual risk depends on medical history, medications, pregnancy status, age, and diagnosis. Talk with a qualified clinician before changing treatment, supplement, or medication routines.