The Impact of Coffee Consumption Immediately Before a Nap on Post-Nap Grumpiness
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Coffee, Placebo.
- Who it may be relevant to
- Registry conditions: Irritability. Basic parameters: 18 years — 99 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Center list to be confirmed — check the primary protocol.
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Official 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
Overview
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
- Other Coffee
It's literally coffee - Other Placebo
It's a placebo
Primary outcome measures
- Post-Nap Grumpiness Score [Time frame: Exactly 90 seconds post-air horn blast.]
Eligibility criteria
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.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Allocation
- Randomized
- Model
- Parallel assignment
- Masking
- Single blind
- Primary purpose
- Other
Study locations
Center list to be confirmed — check the primary protocol.
Identifiers
NCT: NCT07635303 · Protocol-2026-CAFFEINE-001 · The International Institute of