Contactless, self-directed, at-home salivary DLMO assessment is feasible and reliable for measuring circadian phase in adults with circadian rhythm disorders and healthy controls
The study tested a self-directed, home-based, contactless salivary DLMO protocol in 10 participants (5 with circadian rhythm disorders, 5 controls). Valid DLMOs were obtained in 14/20 assessments, with 8/10 participants having at least one valid DLMO and 6/10 having two. The first and second DLMOs were strongly correlated (r=0.98, p<.001), and the protocol detected clinically relevant differences in circadian timing.
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Contactless, self-directed, at-home salivary DLMO assessment is feasible and reliable for measuring circadian phase in adults with circadian rhythm disorders and healthy controls The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 32/100 (low).
The Claim
Contactless, self-directed, at-home salivary DLMO assessment is feasible and reliable for measuring circadian phase in adults with circadian rhythm disorders and healthy controls
This conclusion is most relevant to: Adults aged 27-63 with Circadian-Rhythm Sleep-Wake Disorders (n=5) and healthy controls (n=5).
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Feasibility of a contactless, self-directed, home-based dim-light melatonin onset protocol: the Circadia pilot study. (Sleep advances : a journal of the Sleep Research Society, 2026) —
How It Works
The proposed biological pathway:
- ▸Participants receive mailed kit and access online portal
- ▸They track sleep, activity, and light for 4-6 weeks
- ▸They collect saliva samples at home at specified times for DLMO
- ▸DLMO is calculated from salivary melatonin levels
Who Might Benefit
Evidence fit by population:
- ▸Adults aged 27-63 with Circadian-Rhythm Sleep-Wake Disorders (n=5) and healthy controls (n=5)
Recommended Dose
N/A
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Small sample size (n=10)
- ▸High failure rate (6/20 assessments failed) due to compliance errors or melatonin levels
- ▸No comparison to in-lab DLMO assessments
Frequently Asked Questions
What is DLMO and why is it important?▼
DLMO (dim light melatonin onset) is a marker of endogenous circadian phase, used to assess circadian rhythm disorders.
How many participants had valid DLMO results?▼
Valid DLMOs were obtained in 14 out of 20 assessments, with 8 out of 10 participants having at least one valid DLMO and 6 out of 10 having two.
What were the main reasons for DLMO failures?▼
Failures were due to compliance errors (e.g., bright light exposure) or melatonin levels consistently below or above threshold.
How reliable was the at-home DLMO protocol?▼
The first and second DLMOs were strongly correlated (r=0.98, p<.001), indicating high test-retest reliability.
References
- 1.Bormes G, Love JJ, Burns AC, Akeju O, Cherry JM, Kantesaria N, Kunorozva L, Qadri S, Rahman SA, Scheer FAJL, Westover B, Winkelman JW, Saxena R, Lane JM. “Feasibility of a contactless, self-directed, home-based dim-light melatonin onset protocol: the Circadia pilot study..” Sleep advances : a journal of the Sleep Research Society, 2026. PMID: 42662684 DOI: 10.1093/sleepadvances/zpag081