Naps and circadian rhythms in postmenopausal women

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
In-Young YoonR D Langer

Abstract

Napping patterns and relationships among naps, circadian rhythms, and nocturnal sleep were evaluated in postmenopausal women. Naps and nocturnal sleep were compared between depressed women and healthy volunteers. The study included 436 postmenopausal women between the ages of 50 and 81 years. Psychiatric interviews were conducted using the Structured Clinical Interview for DSM-IV Axis I Disorders. Each participant wore a wrist-activity monitor and kept a daily sleep log at home for 1 week. The major urinary melatonin metabolite (6-sulfatoxymelatonin [aMT6s]) was measured for two 24-hour periods at home. There was no significant difference in naps and nocturnal sleep patterns between depressed participants (n = 30) and those with no history of mental disorder (n = 222). Three peaks occurred in the timing of napping: approximately 1 hour before bedtime, 8 to 9 hours after wake-up time, and 2 hours after waking, in descending order of magnitude. Significant inverse correlations were observed between evening nap duration and both wake-up time and aMT6s acrophase. The onset time of aMT6s excretion was advanced by 32 minutes in evening nappers. Evening napping, a characteristic of these postmenopausal women, may be related to an adva...Continue Reading

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Citations

Apr 9, 2004·BMC Psychiatry·Daniel F KripkeRobert D Langer
Nov 15, 2005·BMC Psychiatry·Richard T LovingMichael A Grandner
Dec 3, 2005·Journal of Circadian Rhythms·Girardin Jean-LouisDouglas R Lazzaro
Aug 12, 2008·Journal of the American Geriatrics Society·Natalie D DautovichMeredeth Rowe
Feb 15, 2011·Journal of the American Geriatrics Society·Scott S CampbellPatricia J Murphy
Dec 3, 2014·Sleep Medicine Reviews·Leah A IrishMartica H Hall
Dec 29, 2007·Journal of Korean Medical Science·Doo Heum ParkRobert D Langer
Jun 3, 2015·T︠S︡itologii︠a︡ i genetika·O R StratulaYu M Sivolap

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