---
title: "Caffeine Plus a 15-Minute Nap Beats Either Alone"
url: https://stacklist.com/card/0f12a923-c78e-4842-956c-31434f9db4af
source_url: "https://pubmed.ncbi.nlm.nih.gov/9401427/"
stack: https://stacklist.com/c/wellness/stack/f2eedf5e-26d1-4fb4-9246-f3b127aed0e5
summary: "Caffeine combined with a 15-minute nap during a 30-minute break significantly reduces driving incidents in sleepy drivers compared to either treatment alone. The combined treatment reduced incidents to 9% of placebo levels versus 34% for caffeine alone during a 2-hour monotonous afternoon drive simulation."
tags: "caffeine, napping, driver-fatigue, sleepiness, car-simulator, alertness, sleep-research"
key_entities: "caffeine (concept), napping (concept), driver sleepiness (concept), car simulator (technology), electroencephalography (concept), central nervous system stimulants (concept)"
classification: "reference"
content_hash: "sha256:a0406a58a5d4e0b573271013aa37ceaf9ed387b23f1f48f612891a92fddfc7fa"
acp_version: "0.2"
token_counts_approximate: 572
visibility: public
agent_accessible: true
status: "final"
---

# Caffeine Plus a 15-Minute Nap Beats Either Alone

Full text links Cite Display options Display options Format Abstract PubMed PMID Linked Discoveries Abstract Previous research has shown that caffeine and a < 15-min nap effectively and separately reduce sleepiness in drivers for 1 hr. In the present study, we examined in 12 sleepy individuals the treatments combined, taken during a 30-min break, prior to a longer (2 hr) continuous monotonous afternoon drive in a car simulator. Nonnap comparisons were 200 mg caffeine only and placebo. For placebo, driving incidents, subjective and electroencephalographic measures of sleepiness all reflected a mid-afternoon peak. This peak was significantly reduced by caffeine and eliminated by the combined treatment, which reduced incidents to 9% of placebo levels versus 34% of placebo levels for caffeine alone. Naps comprising "nonsleep dozing" were still effective. PubMed Disclaimer Publication types Clinical Trial Actions Search in PubMed Search in MeSH Add to Search Controlled Clinical Trial Actions Search in PubMed Search in MeSH Add to Search Research Support, Non-U.S. Gov't Actions Search in PubMed Search in MeSH Add to Search MeSH terms Adult Actions Search in PubMed Search in MeSH Add to Search Automobile Driving* Actions Search in PubMed Search in MeSH Add to Search Caffeine / pharmacology* Actions Search in PubMed Search in MeSH Add to Search Central Nervous System Stimulants / pharmacology* Actions Search in PubMed Search in MeSH Add to Search Electroencephalography / drug effects Actions Search in PubMed Search in MeSH Add to Search Female Actions Search in PubMed Search in MeSH Add to Search Humans Actions Search in PubMed Search in MeSH Add to Search Male Actions Search in PubMed Search in MeSH Add to Search Sleep / drug effects Actions Search in PubMed Search in MeSH Add to Search Sleep / physiology* Actions Search in PubMed Search in MeSH Add to Search Sleep Stages / drug effects* Actions Search in PubMed Search in MeSH Add to Search Substances Central Nervous System Stimulants Actions Search in PubMed Search in MeSH Add to Search Caffeine Actions Search in PubMed Search in MeSH Add to Search LinkOut - more resources Full Text Sources Wiley Medical MedlinePlus Health Information Research Materials NCI CPTC Antibody Characterization Program