Home-based tailored light therapy improves memory, sleep efficiency, and circadian stimulus in mild cognitive impairment
In a 24-week randomized placebo-controlled trial, active light therapy significantly improved ADAS-Cog memory scores (p=0.035) and morning circadian stimulus AUC (0.021 vs -0.030, p=0.025) compared to placebo. Sleep percent also improved (-0.21 vs -1.29, p=0.042) and wake after sleep onset decreased (2.19 vs 8.23 min, p=0.031) in the active group.
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Home-based tailored light therapy improves memory, sleep efficiency, and circadian stimulus in mild cognitive impairment The current body of evidence comprises 1 study, including 1 randomized controlled trial. EvidenceHub rates the overall confidence at 42/100 (low).
The Claim
Home-based tailored light therapy improves memory, sleep efficiency, and circadian stimulus in mild cognitive impairment
This conclusion is most relevant to: 61 participants with mild cognitive impairment (mean age 69.7 years, 52% male, mean MoCA 21.4).
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Home-Based Tailored Light Therapy for Sleep, Mood, and Cognitive Outcomes in Mild Cognitive Impairment: A Randomized Trial. (Journal of applied gerontology : the official journal of the Southern Gerontological Society, 2026) —
How It Works
The proposed biological pathway:
- ▸Light exposure increases circadian stimulus (CS) AUC
- ▸Enhanced circadian entrainment
- ▸Improved sleep consolidation
- ▸Result: Better memory and sleep outcomes
Who Might Benefit
Evidence fit by population:
- ▸61 participants with mild cognitive impairment (mean age 69.7 years, 52% male, mean MoCA 21.4)
Recommended Dose
N/A
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Small sample size (n=61)
- ▸No blinding of participants to light condition may introduce bias
- ▸Short post-intervention follow-up (only to week 37)
Frequently Asked Questions
What is the primary outcome of this light therapy trial?▼
The primary outcome was improvement in ADAS-Cog memory scores, which showed a significant benefit for active light over placebo (p=0.035).
How long did the intervention last?▼
The intervention lasted 24 weeks, with assessments at baseline, week 13, week 25, and post-intervention at week 37.
Who was eligible for this study?▼
Participants were people living with mild cognitive impairment (MCI), with a mean age of 69.7 years and mean MoCA score of 21.4.
What sleep measures improved with active light?▼
Sleep percent, wake percent, and wake after sleep onset all significantly improved in the active light group compared to placebo.
References
- 1.Li W, Suarez-Farinas M, Shuster A, Mednick S, Figueiro MG. “Home-Based Tailored Light Therapy for Sleep, Mood, and Cognitive Outcomes in Mild Cognitive Impairment: A Randomized Trial..” Journal of applied gerontology : the official journal of the Southern Gerontological Society, 2026. PMID: 42527889 DOI: 10.1177/07334648261474211