Overview

Aim 2 will investigate the effect of 3 different light exposure lengths on sleep, mood and agitation in persons with Alzheimer's disease. Participants will be randomly assigned to one of three conditions of light exposure: 1) 2-h morning light exposure; 2) 4-h morning light exposure; and 3) all day light exposure.

Eligibility

Inclusion Criteria:

• Diagnosis of Alzheimer's disease or related dementia with a Montreal Cognitive Assessment score <25
• Sleep disturbance with a Pittsburgh Sleep Quality Index score ≥5

Exclusion Criteria:

• Extensive brain vascular disease, traumatic brain injury, multiple sclerosis, Parkinson's Disease
• Obstructing cataracts
• Severe macular degeneration
• Use of sleep medication
• Use of oral melatonin
• untreated moderate to severe sleep apnea
• Severe restless leg syndrome
• Blindness