Jun 19, 2018

Light Exposure in Nursing Homes Decreases Sleep Disturbances, Depression and Agitation in Alzheimer's Patients

A tailored lighting program in nursing homes can positively impact sleep, mood and behavior for patients with Alzheimer's disease

Bright Light Alzheimer's Reading Room
by Alzheimer's Reading Room

Tailored lighting intervention in nursing homes can positively impact:
  • sleep, 
  • mood 
  • and, behavior in patients with Alzheimer's disease,
according to preliminary findings from this study.

Lighting intervention improves sleep and mood for Alzheimer's patients

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People with Alzheimer's disease and related dementia often experience
  • sleep problems, 
  • wandering, 
  • and, associated daytime irritability.

This study tested whether a
  • tailored daytime lighting intervention could improve sleep and behavior in Alzheimer's patients living in long-term care facilities.

Compared to baseline and to the inactive lighting condition,
  • the lighting intervention significantly decreased sleep disturbances, 
  • depression 
  • and agitation.

While all measures improved, the most significant improvement was seen in sleep quality.
"Here we show that if the stimulus (light dose) is carefully delivered and measured, it can have a strong impact on sleep, depression and agitation. 
Depression was a secondary measure, and I was pleasantly surprised by the positive impact of the light treatment on depression scores." ~ said principal investigator and lead author Mariana Figueiro, PhD, a professor and director at the Lighting Research Center at Rensselaer Polytechnic Institute.

The study involved 43 subjects diagnosed with Alzheimer's disease and related dementia who were exposed to an active and inactive tailored lighting intervention for successive 4-week periods, spaced by a 4-week washout period.

The lighting intervention was added to spaces in which patients spent most of their waking hours and was energized from wake time until 6 p.m.

Calibrated personal light meters monitored exposures.

Measures of sleep disturbances (Pittsburgh Sleep Quality Index), mood (Cornell Scale for Depression in Dementia) and agitation (Cohen-Mansfield Agitation Index) were collected at baseline and during the last week of the intervention.

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This study was funded by the National Institute on Aging, NIH grant #R01AG034157.