• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
Tech

Why Your Smartphone Won’t Let You Sleep

By
John Kell
John Kell
Contributing Writer and author of CIO Intelligence
Down Arrow Button Icon
By
John Kell
John Kell
Contributing Writer and author of CIO Intelligence
Down Arrow Button Icon
November 16, 2015, 3:32 PM ET
558175165
Woman reading and texting on smartphone in bedPhotograph by Getty Images

A London-based researcher reportedly says smartphone makers should consider adding an automatic “bedtime mode” that would reduce light intensity and make it easier for users to sleep.

Professor Paul Gringras of Evelina Children’s Hospital in London has said device manufacturers need to show more “responsibility” when it comes to making future models of smartphones, tablets, and e-readers, BBC News reports,

Gringras’s research concluded that the type of light used in light-emitting devices produced today uses emissions that are “likely to cause the most disruption to sleep,” as they most effectively suppress melatonin and increase alertness. Thus, Gringras says that “brighter and bluer” isn’t always better—at least when it comes to sleep.

The professor believes that future software could be better optimized when the smart devices are used at night. He says an automatic “bedtime mode” should shift blue and green light emissions to yellow and red—which would reduce backlight intensity.

About the Author
By John KellContributing Writer and author of CIO Intelligence

John Kell is a contributing writer for Fortune and author of Fortune’s CIO Intelligence newsletter.

See full bioRight Arrow Button Icon

Latest in Tech

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
  • Group Subscriptions
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Tech

Crypto
Kalshi locks in $22 billion valuation, gaining slight edge over its rival Polymarket
By March 20, 2026
6 minutes ago
Big TechEntrepreneurs
Mark Cuban reads 1,000 emails a day—now he’s using a Mac Mini to fight the AI-generated flood threatening his clean inbox obsession
By Marco Quiroz-GutierrezMarch 20, 2026
1 hour ago
Stressed out job seeker on laptop
Successjob hunting
Job seekers aren’t imagining things: the number of candidates ghosted by employers just reached a three-year high thanks to AI
By Emma BurleighMarch 20, 2026
5 hours ago
SuccessCareers
AI boom is fueling demand for skilled trades—and demand for technicians, HVAC workers, and electricians is soaring, with six-figure salaries to match
By Preston ForeMarch 20, 2026
5 hours ago
LawX
Three Tennessee teenagers are suing Elon Musk’s xAI for creating sexually explicit images of them
By The Associated Press and Travis LollerMarch 20, 2026
6 hours ago
Trump standing waving hi at a crowd
AIDonald Trump
The White House has a plan for AI regulation, and it starts with keeping states out of it
By The Associated Press and Seung Min KimMarch 20, 2026
8 hours ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.