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The Effects of Caffeine on Simulated Night-Shift Work and Subsequent Daytime Sleep
Abstract
Thirty healthy volunteers were randomly assigned to either a caffeine or a placebo group to investigate the alerting effects of caffeine at night. Subjects adhered to a simulated night-shift schedule for 5 consecutive nights. On the first 3 nights, 2 mg/kg caffeine was added to decaffeinated coffee at 2220 and 0120 hours for the caffeine group. On nights 4 and 5 both groups received placebo. Each night, subjects completed five 60-minute sessions of a computerized simulated assembly line performance task (SALT), a multiple sleep latency test (MSLT) and questionnaires. Daytime sleep was recorded in the laboratory between 0900 and 1700 hours each day following nighttime testing. Caffeine decreased physiological sleep tendency on the night shift compared with placebo; however, the two groups performed at equivalent levels on the SALT. On nights 4 and 5, when both groups received placebo, there were no differences between the groups on the MSLT, suggesting the absence of a discontinuation effect. There were no differences on daytime polysomnograms between the groups.
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“Melatonin appears to improve adaptation to day-time sleep schedules and increases the length of sleep16,17.”
From Circadian rhythm disruption and mental health (2020) · cites this paper as [17]
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Metadata
- Authors
- Muehlbach, M. J., & Walsh, J. K.
- Affiliations
- St. Luke's Hospital (US)
- Corresponding author
- Muehlbach, Mark J.
- Venue
- Sleep
- Publisher
- Oxford University Press (OUP)
- Published
- 1995-01
- Volume
- 18
- Issue
- 1
- Pages
- 22-29
- ISSN
- 0161-8105 (ISSN-L)
- 1550-9109
- OpenAlex
- W167991554
- Cited by
- 122
- References
- 0
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 2 · 2022: 2 · 2021: 1 · 2020: 6 · 2019: 4 · 2018: 1 · 2017: 2 · 2016: 4 · 2015: 2 · 2014: 6 · 2013: 1 · 2012: 8
- FWCI
- 2.56
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- SLEEP (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Health Sciences › Medicine › Pharmacology (medical) › Coffee research and impacts
- Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
- Keywords
- caffeine, night shift work, circadian misalignment, daytime sleep, alertness, multiple sleep latency test, caffeine withdrawal, shift work
- MeSH terms
- Adult, Body Weight, Caffeine, Circadian Rhythm, Female, Humans, Male, Placebos, Surveys and Questionnaires, Sleep, Task Performance and Analysis, Wakefulness, Work
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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