Changes in ability to sleep are common for older adults. Sleep architecture evolves with age, and may be associated with reduction in both total sleep time and the amount of time spent in deep or slow-wave sleep—as well as weakening of the suprachiasmat-ic nuclei (one's biological clock) circa-dian rhythm. While old age is associated with an increased prevalence of insomnia symptoms, this correlation is not noticed in healthy older adults who slept well as when younger.
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