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

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

Status
Not yet recruiting
Phases
Unknown
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07635303
Acronym
JAVA-NAP
Enrollment
50
Registered
2026-06-09
Start date
2026-07-01
Completion date
2028-07-01
Last updated
2026-06-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Irritability

Keywords

Caffeine, Napping, Grumpiness, Office Survival, Espresso

Brief summary

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.

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).

Interventions

OTHERCoffee

It's literally coffee

OTHERPlacebo

It's a placebo

Sponsors

Hightower Clinical
Lead SponsorNETWORK

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
SINGLE (Subject)

Eligibility

Sex/Gender
ALL
Age
18 Years to 99 Years
Healthy volunteers
No

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.

Design outcomes

Primary

MeasureTime frameDescription
Post-Nap Grumpiness ScoreExactly 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").

Contacts

CONTACTBrad P Guy in Charge
brad@hightowerclinical.com405-555-5555

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Jun 10, 2026