Increased light exposure consolidates sleep and strengthens circadian rhythms in severe Alzheimer's disease patients.

Sonia Ancoli-Israel, Philip Gehrman, Jennifer L. Martin, Tamar Shochat, Matthew Marler, Jody Corey-Bloom, Leah Levi

Research output: Contribution to journalArticlepeer-review

Abstract

Sleep in the nursing home environment is extremely fragmented, possibly in part as a result of decreased light exposure. This study examined the effect of light on sleep and circadian activity rhythms in patients with probable or possible Alzheimer's disease. Results showed that both morning and evening bright light resulted in more consolidated sleep at night, as measured with wrist actigraphy. Evening light also increased the quality of the circadian activity rhythm, as measured by a 5-parameter extended cosine model (amplitude, acrophase, nadir, slope of the curve, and relative width of the peak and trough). Increasing light exposure throughout the day and evening is likely to have the most beneficial effect on sleep and on circadian rhythms in patients with dementia. It would behoove nursing homes to consider increasing ambient light in multipurpose rooms where patients often spend much of their days.

Original languageEnglish
Pages (from-to)22-36
Number of pages15
JournalBehavioral Sleep Medicine
Volume1
Issue number1
DOIs
StatePublished - 2003
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by National Institute on Aging AG08415; National Cancer Institute CA85264; the Department of Veterans Affairs VISN–22 Mental Illness Research, Education, and Clinical Center; and the Research Service of the Veterans Affairs San Diego Healthcare System.

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience (miscellaneous)
  • Psychology (miscellaneous)
  • Medicine (miscellaneous)

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