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Math Software Seeks to Solve Shift Workers, Astronauts Sleep Schedules

http://www.sleepreviewmag.com/sleep_report/2010-05-05_05.asp

Mild to Moderate Sleep Apnea Increases Stroke Risk

“OSA May Data from the Sleep Heart Health Study show that even moderate levels of sleep apnea carry significant risk for stroke for men and that severe sleep apnea can also increase stroke risk for women. It was published online March 25 in the American Journal of Respiratory and Critical Care Medicine.

The study authors report that men with the most severe OSA were twice as likely to have a stroke as men in the quartile with the least severe OSA during a median 8.7 years of follow-up.”

Increase Stroke Risk in Older Men

Men with moderate to severe sleep apnea were nearly three times more likely to have a stroke than men without sleep apnea or with mild sleep apnea, according to research published ahead of print in the American Journal of Respiratory and Critical Care Medicine.

The same risk levels did not appear in women. Investigators believe this may be because men tend to develop sleep apnea at younger ages.

“It’s possible that the stroke risk is related to cumulative effects of sleep apnea adversely influencing health over many years,” noted Susan Redline, MD, MPH, professor of medicine, pediatrics, and epidemiology and biostatistics, at Case Western Reserve University in Cleveland and lead author of the paper.

These findings support earlier studies linking sleep apnea to stroke risk, according to the authors, who believe the “strong adjusted association between ischemic stroke and OAHI [obstructive apnea hypopnea index] in community-dwelling men with mild to moderate sleep apnea suggests that this is an appropriate target for future stroke prevention trials.”

http://ajrccm.atsjournals.org/cgi/content/abstract/200911-1746OCv1

Simple Devices Associated With Better Sleep Quality in ICU Conditions

“April 15, 2010 — Low-tech aids could help patients get a better night’s sleep in the high-tech environment of the intensive care unit (ICU), according to a pilot study published online April 15 in Critical Care.

In healthy individuals subjected to conditions resembling those of a busy ICU, earplugs and eye shades were associated with

  • more time spent in rapid eye movement (REM) sleep,
  • shorter REM latency,
  • less arousal, and
  • elevated urinary melatonin levels.

Limitations of the study include that the these findings were obtained from healthy volunteers in a sleep laboratory, observed only in 9-hour blocks; therefore, the implications for real ICU patients, who have many other stressors and are in the ICU around the clock, may be limited. In addition, the effect of light and noise were examined together, rather than looking at the effect of each component separately.

Still, Ms. Jiang and associates conclude that the study ‘provides a reasonable basis for promoting the use of earplugs and eye masks for ICU patients’ and recommend that they be used routinely in this population.”

Maintaining Regular Daily Routines Linked with Better Sleep Quality in Older Adults

http://www.sleepreviewmag.com/sleep_report/2010-04-14_06.asp

Sleep Apnea Linked to Hard-to-diagnose Eye Disorders: Floppy Eyelid Syndrome Associated with Obstructive Sleep Apnea

http://www.ophsource.org/periodicals/ophtha/article/S0161-6420%2810%2900189-2/fulltext#sec5

The FDA approves a drug for insomnia.

http://www.somaxon.com/pages/silenor.htm

The Spread of Sleep Loss Influences Drug Use in Adolescent Social Networks

Troubled sleep is a commonly cited consequence of adolescent drug use, but it has rarely been studied as a cause. Nor have there been any studies of the extent to which sleep behavior can spread in social networks from person to person to person. Here we map the social networks of 8,349 adolescents in order to study how sleep behavior spreads, how drug use behavior spreads, and how a friend’s sleep behavior influences one’s own drug use. We find clusters of poor sleep behavior and drug use that extend up to four degrees of separation (to one’s friends’ friends’ friends’ friends) in the social network. Prospective regression models show that being central in the network negatively influences future sleep outcomes, but not vice versa. Moreover, if a friend sleeps ≤7 hours, it increases the likelihood a person sleeps ≤7 hours by 11%. If a friend uses marijuana, it increases the likelihood of marijuana use by 110%. Finally, the likelihood that an individual uses drugs increases by 19% when a friend sleeps ≤7 hours, and a mediation analysis shows that 20% of this effect results from the spread of sleep behavior from one person to another. This is the first study to suggest that the spread of one behavior in social networks influences the spread of another. The results indicate that interventions should focus on healthy sleep to prevent drug use and targeting specific individuals may improve outcomes across the entire social network.

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0009775

Study Identifies Common SIDS Risk Factors

http://www.sleepreviewmag.com/sleep_report/2010-03-03_01.asp?frmNewsletter=topten

Take Naps. Get Smarter

http://www.sleepreviewmag.com/sleep_report/2010-03-03_06.asp?frmNewsletter=topten

Extremes of Sleep Related to Increased Fat Around Organs

http://www.sleepreviewmag.com/sleep_report/2010-03-24_05.asp

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