jintropin

Calendar

January 2011
M T W T F S S
 12
3456789
10111213141516
17181920212223
24252627282930
31  

Pages

Archives

Recent Posts

Blogroll






 Exploring Sleep

By Rick Nauert PhD Senior News Editor
Reviewed by John M. Grohol, Psy.D. on October 1, 2010 

A provocative new study suggests too much sleep, or not enough sleep, influences how long a person will live.

In a novel research design, researchers from the University of California, San Diego discovered that less than five hours of sleep a night is probably not enough, and eight hours of sleep is probably too much.

A team of scientists, headed by Daniel F. Kripke, MD, revisited original research conducted between 1995 and 1999.

In that earlier study, part of the Women’s Health Initiative, Kripke and colleagues had monitored 459 women living in San Diego (ranging in age from 50 to 81) to determine if sleep duration could be associated with mortality.

Fourteen years later, they returned to see who was still alive and well.

Of the original participants, 444 were located and evaluated. Eighty-six women had died. Previous studies, based upon questionnaires of people’s sleep habits, had posited that sleeping 6.5 to 7.5 hours per night was associated with best survival.

Kripke and colleagues, whose 1990s research had used wrist activity monitors to record sleep durations, essentially confirmed those findings, but with a twist.

“The surprise was that when sleep was measured objectively, the best survival was observed among women who slept 5 to 6.5 hours,” Kripke said.

“Women who slept less than five hours a night or more than 6.5 hours were less likely to be alive at the 14-year followup.”

The findings are published online in the journal Sleep Medicine.

Read in Full:  http://psychcentral.com/news/2010/10/01/secret-to-long-life-just-enough-sleep/19036.html

 



Leave a Reply

*