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Sleep-wake patterns among postmenopausal women: a 24-hour unattended polysomnographic study
G Jean-Louis1, D F Kripke, J D Assmus
1Department of Psychiatry, University of California San Diego, La Jolla 92093-0667, USA. gjeanlouis@ucsd.edu
Background:
Circadian sleep-wake profiles in postmenopausal women were examined to explore relationships between nocturnal and out-of-bed sleep.
Methods:
Twenty-one home recordings were obtained with unattended polysomnography from women ranging from 56 to 77 years of age.
Results:
While maintaining their daily routines, volunteers slept an average of 439 minutes throughout the 24-hour recordings. Ten percent of the accumulated sleep time was recorded out of bed.
Conclusions:
Greater age was associated with more afternoon-evening sleep. Sleep was also frequently observed shortly after volunteers arose from bed in the morning.