The Study
Psychobiological Correlates of Perceived Physical Activity Barriers: Insomnia, Chronotype, and Caffeine Consumption
This study looked at whether students who have trouble sleeping, are night owls, or drink a lot of coffee feel more or less blocked from exercising. It found tiny links, like maybe night owls feel a little more blocked, but it’s so small it’s probably just noise. It didn’t prove that sleep or coffee causes these feelings — just that they happened at the same time.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
This study looked at whether students who have trouble falling asleep, wake up too early, like being up late, or drink coffee feel more blocked from working out.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 542 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1No, these factors don't meaningfully explain why students feel they can't exercise — other things like time, money, or motivation matter much more.
- 2Trouble falling asleep was slightly linked to feeling more barriers (but only 1–2% of the feeling was explained).
- 3Waking up early was slightly linked to feeling fewer barriers.
- 4Coffee was weakly linked to feeling fewer environmental barriers (like no gym nearby).
- 5All together, these factors explained less than 5% of why students felt blocked.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
International Journal of Environmental Research and Public Health
Year
2026
Authors
Mehmet Emre Eryücel, M. Akıl
Related Content
Claims (5)
Among university students aged 18–27, trouble falling asleep is linked only slightly to higher perceptions of barriers to physical activity, and this sleep issue accounts for less than 5% of why people feel these barriers exist.
Among university students aged 18–27, those who report poor sleep patterns tend to report fewer obstacles to physical activity, but this relationship is very weak and may not reflect a real connection.
Among university students aged 18–27, whether someone prefers mornings or evenings does not meaningfully relate to how much they feel physical activity is hard to do, once sleep and caffeine use are taken into account.
In university students aged 18–27, sleep patterns, natural sleep-wake preferences, and caffeine consumption together explain less than 5% of why people feel blocked from being physically active.
Among university students aged 18–27, daily caffeine consumption is linked to slightly lower perceptions of environmental obstacles to physical activity, but this link accounts for less than 1% of the variation and does not apply to personal or social barriers.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.