Quantcast
ZME Science
  • News
  • Environment
  • Health
  • Future
  • Space
  • Features
    Menu
    Natural Sciences
    Health
    History & Humanities
    Space & Astronomy
    Technology
    Culture
    Resources
    Natural Sciences

    Physics

    • Matter and Energy
    • Quantum Mechanics
    • Thermodynamics

    Chemistry

    • Periodic Table
    • Applied Chemistry
    • Materials
    • Physical Chemistry

    Biology

    • Anatomy
    • Biochemistry
    • Ecology
    • Genetics
    • Microbiology
    • Plants and Fungi

    Geology and Paleontology

    • Planet Earth
    • Earth Dynamics
    • Rocks and Minerals
    • Volcanoes
    • Dinosaurs
    • Fossils

    Animals

    • Mammals
    • Birds
    • Fish
    • Reptiles
    • Amphibians
    • Invertebrates
    • Pets
    • Conservation
    • Animals Facts

    Climate and Weather

    • Climate Change
    • Weather and Atmosphere

    Geography

    Mathematics

    Health
    • Drugs
    • Diseases and Conditions
    • Human Body
    • Mind and Brain
    • Food and Nutrition
    • Wellness
    History & Humanities
    • Anthropology
    • Archaeology
    • Economics
    • History
    • People
    • Sociology
    Space & Astronomy
    • The Solar System
    • The Sun
    • The Moon
    • Planets
    • Asteroids, Meteors and Comets
    • Astronomy
    • Astrophysics
    • Cosmology
    • Exoplanets and Alien Life
    • Spaceflight and Exploration
    Technology
    • Computer Science & IT
    • Engineering
    • Inventions
    • Sustainability
    • Renewable Energy
    • Green Living
    Culture
    • Culture and Society
    • Bizarre Stories
    • Lifestyle
    • Art and Music
    • Gaming
    • Books
    • Movies and Shows
    Resources
    • How To
    • Science Careers
    • Metascience
    • Fringe Science
    • Science Experiments
    • School and Study
    • Natural Sciences
    • Health
    • History and Humanities
    • Space & Astronomy
    • Culture
    • Technology
    • Resources
  • Reviews
  • More
    • Agriculture
    • Anthropology
    • Biology
    • Chemistry
    • Electronics
    • Geology
    • History
    • Mathematics
    • Nanotechnology
    • Economics
    • Paleontology
    • Physics
    • Psychology
    • Robotics
  • About Us
    • About
    • The Team
    • Advertise
    • Contribute
    • Privacy Policy
    • Contact
No Result
View All Result
ZME Science

No Result
View All Result
ZME Science

Home → Health

Caffeine is essentially useless after three sleep-deprived nights

After only three nights of sleeping five hours or less, caffeine stops working.

Tibi Puiu by Tibi Puiu
June 14, 2016
in Health, News, Nutrition

Coffee
Credit: Pixabay

Within thirty minutes after your first cup of joe, caffeine peak absorption occurs, stimulating your nerves and causing adrenalin to be released. Adrenaline increases your heart rate, which results in more blood pumped per minute. This blood carries extra oxygen to your brain, making you feel more alert.

No wonder coffee is the go-to drug for most of the working class which has to wake forcefully at 7 AM, catapult a bagel down the mouth and catch that morning commute. For the seriously sleep deprived, though, coffee becomes essentially useless after only three days of sleeping five hours per night.

The finding was made by Tracy Jill Doty, a research scientist at Walter Reed Army Institute of Research, and colleagues. The team enlisted 48 healthy volunteers for their double-blind, placebo-controlled study.

For a total of five days, participants were restricted to only five hours of shut-eye each night. Volunteers were given either a 200mg portion of caffeine or a placebo — twice daily. During the wake periods, every hour the researchers would run cognitive tests on the participants like the Profile of Mood States (POMS), and the Stanford Sleepiness Scale (SSS).

“We were particularly surprised that the performance advantage conferred by two daily 200 mg doses of caffeine was lost after three nights of sleep restriction,” Doty said about the study’s results due to be published in the journal Sleep.

It’s very likely that the sleep deprived, like shift workers, noticed this already. The obvious solution is to drink even more coffee, and although the study limited itself to two servings per day, there’s reason to believe the diminishing returns effect occurs after five or even eight cups in a day. Suffice to say, drinking too much coffee can be bad.

Was this helpful?


Thanks for your feedback!

Related posts:
  1. Drinking too much caffeine can kill you — Latte, soda, and energy drink combo kill US teen
  2. More bang for your cup: new algorithm determines ideal caffeine intake for the best results
  3. Italy essentially shuts down Lombardy, quarantining 16 million people
  4. Powder caffeine overdose risks prompts FDA to issue letter of warning to producers
  5. Spraying the streets with disinfectant is useless and needs to stop now
Tags: caffeinecoffeesleep

ADVERTISEMENT
  • News
  • Environment
  • Health
  • Future
  • Space
  • Features
  • Reviews
  • More
  • About Us

© 2007-2021 ZME Science - Not exactly rocket science. All Rights Reserved.

No Result
View All Result
  • News
  • Environment
  • Health
  • Future
  • Space
  • Features
    • Natural Sciences
    • Health
    • History and Humanities
    • Space & Astronomy
    • Culture
    • Technology
    • Resources
  • Reviews
  • More
    • Agriculture
    • Anthropology
    • Biology
    • Chemistry
    • Electronics
    • Geology
    • History
    • Mathematics
    • Nanotechnology
    • Economics
    • Paleontology
    • Physics
    • Psychology
    • Robotics
  • About Us
    • About
    • The Team
    • Advertise
    • Contribute
    • Privacy Policy
    • Contact

© 2007-2021 ZME Science - Not exactly rocket science. All Rights Reserved.

Don’t you want to get smarter every day?

YES, sign me up!

Over 35,000 subscribers can’t be wrong. Don’t worry, we never spam. By signing up you agree to our privacy policy.

✕
ZME Science News

FREE
VIEW