Video
Shop
Culture
Family
Wellness
Food
Living
Style

Travel
News
Book Club

Newsletter

Privacy Policy
Your US State Privacy Rights
Children's Online Privacy Policy
Interest-Based Ads
Terms of Use
Do Not Sell My Info
Contact Us
© 2026 ABC News

NaN:NaN

sleep
March 2, 2011

AC

Researchers say change in voice indicates level of fatigue.

Up Next in news

Childhood Obesity Linked to Lack of Sleep

Childhood Obesity Linked to Lack of Sleep

January 23, 2011

Would You Let a Drowsy Doc Operate on You?

Would You Let a Drowsy Doc Operate on You?

December 29, 2010

Sleepiness Might Be in Your Genes, Study Finds

Sleepiness Might Be in Your Genes, Study Finds

October 25, 2010

The latest lifestyle and entertainment news and inspiration for how to live your best life - all from Good Morning America.

Contests
Terms of Use
Privacy Policy
Do Not Sell My Info
Children’s Online Privacy Policy
Advertise with us

Your US State Privacy Rights
Interest-Based Ads
About Nielsen Measurement
Press
Feedback

Shop FAQs
ABC News
ABC
All Videos
All Topics

Sitemap

© 2026 ABC News

Privacy Policy—
Your US State Privacy Rights—
Children's Online Privacy Policy—
Interest-Based Ads—
Terms of Use—
Do Not Sell My Info—
Contact Us—

© 2026 ABC News