The Impact of Coffee Consumption Immediately Before a Nap on Post-Nap Grumpiness (JAVA-NAP)

June 3, 2026 updated by: Hightower Clinical

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

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.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

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).

Study Type

Interventional

Enrollment (Estimated)

50

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

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.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: The Turbo Sleepers
Participants receive 200mg of liquid caffeine disguised in a lukewarm mug of dark roast coffee, followed by an immediate attempt to sleep.
Other: Coffee
It's literally coffee
Placebo Comparator: The Placebo Pouters
Participants receive 0mg of caffeine in an identical lukewarm mug of decaf bean-water, followed by an immediate attempt to sleep.
Other: Placebo
It's a placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
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").
Exactly 90 seconds post-air horn blast.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Hightower Clinical

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

July 1, 2026

Primary Completion (Estimated)

July 1, 2027

Study Completion (Estimated)

July 1, 2028

Study Registration Dates

First Submitted

June 3, 2026

First Submitted That Met QC Criteria

June 3, 2026

First Posted (Actual)

June 9, 2026

Study Record Updates

Last Update Posted (Actual)

June 9, 2026

Last Update Submitted That Met QC Criteria

June 3, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • Protocol-2026-CAFFEINE-001
  • The International Institute of (Other Identifier: The International Institute of Tired People (IITP))

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

IPD Plan Description

Unsure at this time.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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