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Afternoon nap plus caffeine may give athletes an evening edge

NCT ID NCT07652424

Knowledge-focused Sponsor: The Higher Institute of Sport and Physical Education of Sfax Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jul 01, 2026 · Updated 2 times

Summary

This study looks at whether a 90-minute afternoon nap, a moderate dose of caffeine, and a short recovery routine (stretching plus a snack) can improve evening athletic performance. Sixty elite university athletes (30 men, 30 women) will try different combinations of these strategies in a randomized, double-blind, placebo-controlled crossover trial. The goal is to see which combination works best and whether effects differ between sexes or morning-type versus evening-type people.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
caffeine
What this could lead to
If successful, this could give athletes and coaches a simple, evidence-based routine to improve evening performance.
What could go wrong
This is a small, early-stage crossover trial with elite athletes, so results may not apply to everyone. The effects may be small or vary widely.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

60 people

The number who actually took part.

Started

Jan 2025

Finished

May 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 25 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Healthy university athletes aged 18-25 years. * Regular engagement in structured training, defined as at least 10 training sessions per week of approximately 2 h each, across team sports, judo, athletics, tennis, or swimming. * Non-habitual napping, defined as fewer than one nap per week. * Low habitual caffeine intake, defined as \<80 mg/day, assessed using a 7-day dietary recall. * Non-smoker and free from regular medication or recreational drug use. * No musculoskeletal injury during the preceding month. * Good self-reported sleep quality, defined as a Pittsburgh Sleep Quality Index score \<5. * Definite morning chronotype (MEQ score 59-86) or definite evening chronotype (MEQ score 16-41). * For female participants: self-reported regular menstrual cycles (26-32 days), no hormonal contraceptive use, and no self-reported history of menstrual disorders. Exclusion Criteria: * Intermediate chronotype (MEQ score 42-58). * Habitual napping (≥1 nap per week). * Habitual caffeine intake ≥80 mg/day. * Smoking, regular medication use, or recreational drug use. * Musculoskeletal injury during the preceding month. * Pittsburgh Sleep Quality Index score ≥5. * Self-reported irregular menstrual cycles, hormonal contraceptive use, or history of menstrual disorders in female participants. * Self-reported sleep disorder. * Inability or unwillingness to complete all five experimental conditions.

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Conditions

The condition(s) this trial relates to.

circadian rhythm sleep disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Athletic performance Circadian rhythm Exercise performance Sports performance

Contacts and locations

Locations

  • Higher Institute of Sport and Physical Education of Sfax (ISSEP Sfax)

    Sfax, 3000, Tunisia

More trials for these conditions

Other studies related to the condition(s) this trial covers.