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NCT Number: NCT07635303

The Impact of Coffee Consumption Immediately Before a Nap on Post-Nap Grumpiness

The purpose of this study is to determine if drinking a hot cup of coffee immediately before taking a 20-minute nap (the "Caffeine Nap") reduces the standard "grumpiness index" upon waking compared to drinking decaffeinated bean-water.

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Key information

Conditions

Irritability

Age range

18 year–99 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

About this study

Participants will be randomized 1:1 to either the intervention group (active caffeine) or the control group (decaf). Participants will be forced to consume 8 ounces of the assigned beverage at a temperature of exactly 140°F (60°C) within a 2-minute window, and then immediately instructed to "go to sleep" in a room filled with aggressive ticking clocks.

Upon sudden waking via a loud air horn at minute 20, participants will immediately complete the validated "Am I Mad at the World?" Visual Analog Scale (VAS).

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Must look visibly tired by 2:00 PM.

Must have a self-reported history of sighing heavily at emails.

Must be capable of falling asleep under duress.

Exclusion criteria

People who are "morning people" and smile before 8:00 AM (excluded due to baseline psychological bias).

Inability to tolerate lukewarm coffee.

Current employment as a mattress tester.

Treatment and study plan

Coffee

Other

It's literally coffee

Placebo

Other

It's a placebo

Primary outcomes

  1. Post-Nap Grumpiness Score

    Time frame: Exactly 90 seconds post-air horn blast.

    Measured using the proprietary Grump-O-Meter Scale (0 to 10, where 0 is "delightful" and 10 is "don't look at me or I will quit").

Study contacts

Contact information is provided by the study sponsor or research team.

Brad P Guy in Charge

CONTACT

[email protected]

405-555-5555

Sponsors and collaborators

Lead sponsor

Hightower Clinical

Network

Registry information

Official study title

A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Assessment of Immediate Pre-Sleep Caffeine Administration on Self-Reported Post-Nap Irritability and Cognitive Fog in Overworked Adults

Acronym: JAVA-NAP

Important dates

Study start
2026
Primary completion
2027
Study completion
2028
First posted
Jun 9, 2026
Registry last updated
Jun 9, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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