Caffeine has little to no benefit after three nights of sleep restriction

June 13, 2016
Credit: George Hodan/public domain

A new study found that after restricting sleep to 5 hours per night, caffeine use no longer improved alertness or performance after three nights.

Results show that relative to placebo, significantly improved Psychomotor Vigilance Task (PVT) during the first 2 days, but not the last 3 days of sleep restriction.

"We were particularly surprised that the performance advantage conferred by two daily 200 mg doses of caffeine was lost after three nights of ," said lead author Tracy Jill Doty, PhD, research scientist at Walter Reed Army Institute of Research. "These results are important, because caffeine is a stimulant widely used to counteract performance decline following periods of restricted sleep. The data from this study suggests that the same effective daily dose of caffeine is not sufficient to prevent performance decline over multiple days of restricted ."

The research abstract was published recently in an online supplement of the journal Sleep and will be presented Monday, June 13 and Tuesday, June 14, in Denver at SLEEP 2016, the 30th Anniversary Meeting of the Associated Professional Sleep Societies LLC (APSS).

The study group consisted of 48 healthy individuals who participated in a double blind, placebo-controlled study. Sleep was restricted to five hours of time in bed for a total of five days. Participants were administered either 200 mg of caffeine or a placebo twice daily. A cognitive task battery was administered hourly during the wake periods and included a 10-minute PVT, Profile of Mood States (POMS), and the Stanford Sleepiness Scale (SSS). A modified Maintenance of Wakefulness Test (mMWT) was administered six times per day.

Explore further: Chronic sleep restriction negatively affects athletic performance

More information: Abstract Title: Caffeine Efficacy Across a Simulated 5-day Work Week with Sleep Restriction, Abstract ID: 0254

Related Stories

Chronic sleep restriction negatively affects athletic performance

June 13, 2016
A new study found that chronic sleep restriction negatively affects athletic performance.

Amino acid identified associated with poor performance under sleep restriction

June 10, 2016
The amino acid acetylcarnitine may help predict an individual's neurobehavioral performance during chronic sleep restriction, according to results of a new study (abstract 0251) from researchers at the Perelman School of ...

Study links late sleep timing to poorer diet quality and lower physical activity

June 8, 2016
A new study suggests that among healthy adults with a habitual sleep duration of at least 6.5 hours, late sleep timing was associated with higher fast food consumption and lower vegetable intake, particularly among men, as ...

Study shows sleep disturbances common among military spouses

June 8, 2016
A new study found that spouses of military service members experience significant sleep problems, which can impact their health and psychosocial functioning.

Bright light and caffeine improve driver alertness

March 29, 2016
Caffeine and blue-green light have significant effects on improving the driving performance of chronically sleep deprived young people, an innovative QUT study has found.

Late afternoon and early evening caffeine can disrupt sleep at night

November 14, 2013
A new study shows that caffeine consumption even six hours before bedtime can have significant, disruptive effects on sleep.

Recommended for you

Hormone therapy in the menopause transition did not increase stroke risk

November 24, 2017
Postmenopausal hormone therapy is not associated with increased risk of stroke, provided that it is started early, according to a report from Karolinska Institutet published in the journal PLOS Medicine.

When traveling on public transport, you may want to cover your ears

November 22, 2017
The noise levels commuters are exposed to while using public transport or while biking, could induce hearing loss if experienced repeatedly and over long periods of time, according to a study published in the open access ...

Different types of alcohol elicit different emotional responses

November 22, 2017
Different types of alcohol elicit different emotional responses, but spirits are most frequently associated with feelings of aggression, suggests research published in the online journal BMJ Open.

Air pollution linked to poorer quality sperm

November 22, 2017
Air pollution, particularly levels of fine particulate matter (PM2.5), is associated with poorer quality sperm, suggests research published online in Occupational & Environmental Medicine.

Sunrise and sunset guide daily activities of city-dwellers

November 21, 2017
Despite artificial lightning and social conventions, the dynamics of daylight still influence the daily activities of people living in modern, urban environments, according to new research published in PLOS Computational ...

Older men need more protein to maintain muscles

November 21, 2017
The amount of protein recommended by international guidelines is not sufficient to maintain muscle size and strength in older men, according to a new study.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.