The effects of light therapy on sleep, agitation and depression in people with dementia: a systematic review and meta-analysis of randomized controlled trials
Open accessAbstract
Objective To evaluate the effects of light therapy on the alleviation of sleep disturbances, agitation and depression in people with dementia. Methods A search was performed in PubMed, Medline, SCOPUS, Web of Science, EMBASE, CINAHL, Cochrane Library, for studies published between 2000 and 2021. Results A total of 4315 articles were screened. Sixteen articles were eligible for this review and 11 randomized controlled studies were included in the meta-analysis. Light therapy had a significant effect on reducing the number of awakenings in sleep ( n = 4; 95% CI = −.56, −.05; I 2 = 0%; SMD = −.31) but was not significant in reducing the wake after sleep onset ( n = 3; 95% CI = −.14, .59; I 2 = 0%; SMD = .23), agitation ( n = 4; 95% CI = −1.02, .45; I 2 = 87%; SMD = −.28) and depression ( n = 6; 95% CI = −.80, .40, I 2 = 85%; SMD = −.20). Conclusion Light therapy appeared to be more effective in terms of alleviating sleep disturbances, rather than reducing agitation and depression, but its long-term effects remain unclear.
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- Authors
- Fong, K. N., Ge, X., Ting, K., Wei, M., & Cheung, H.
- Affiliations
- Hong Kong Polytechnic University (HK)
- Corresponding author
- Fong, Kenneth NK
- Venue
- American Journal of Alzheimer's Disease & Other Dementias®
- Publisher
- SAGE Publications
- Published
- 2023-03-16
- Volume
- 38
- Pages
- 15333175231160682-15333175231160682
- ISSN
- 0888-4897 (ISSN-L)
- 1533-3175
- 1938-2731
- PMC
- PMC10578524
- OpenAlex
- W4327651337
- Cited by
- 20
- References
- 56
- Citations by year
- 2026: 3 · 2025: 5 · 2024: 9 · 2023: 3
- FWCI
- 0.91
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- American Journal of Alzheimer s Disease & Other Dementias® (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- PolyU Institutional Research Archive (Hong Kong Polytechnic University) (submittedVersion, cc-by-nc-nd)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Innovation and Technology Fund – Mid-stream Research Programme for Universities, Innovation and Technology Commission, Hong Kong SAR (MRP/011/17X)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Keywords
- phototherapy, dementia, sleep disorders, agitation, depression, wake after sleep onset, nocturnal awakenings, circadian rhythm
- MeSH terms
- Dementia, Depression, Humans, Phototherapy, Sleep, Sleep Wake Disorders, Randomized Controlled Trials as Topic
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