This observational study aimed to understand the effect of intervention A on sleep disorders in individuals with Alzheimer's disease receiving sunlight therapy. The primary question of the study was:

Does sunlight therapy improve sleep disorders in Alzheimer's disease?

Participants will complete a questionnaire, undergo sunlight therapy, and have their sleep patterns recorded for 14 days.

Inclusion Criteria:

1. Diagnosed with Alzheimer's disease
2. CDR: 0.5 - 1 point
3. Conscious and able to cooperate with behavioral interventions and telephone interviews
4. Complaints of sleep disturbances, including: daytime sleepiness, difficulty falling asleep, fragmented sleep, nighttime awakening, nocturnal wandering, and sunset syndrome.
5. A cohabiting family member is required as the primary caregiver, who understands and cooperates with this intervention and has signed a consent form.
6. If the patient is already taking sleeping pills, the maintenance dose will not be adjusted.

Exclusion Criteria:

1. Individuals with other brain injury conditions, such as cerebral palsy, brain tumors, traumatic brain injury, or stroke.
2. Individuals with visual impairments (assessed by comparing numbers with fingers at a distance of 30 cm upon admission).
3. Institutional residents.
4. Individuals living alone.
5. Individuals unable to cooperate with behavioral interventions and telephone interviews.