Evidence & Sources

We prioritize sources based on their scientific rigor, independence, and relevance to clinical practice. Our source hierarchy, from highest to lowest priority:

• Systematic reviews and meta-analyses of randomized controlled trials (highest level of evidence).
• Individual randomized controlled trials published in peer-reviewed journals.
• Clinical practice guidelines from recognized medical societies and professional organizations.
• Cohort studies, case-control studies, and observational research published in peer-reviewed journals.
• Regulatory information from government agencies such as the FDA.
• Expert consensus statements and position papers from recognized medical bodies.

We generally avoid citing marketing materials, press releases, or content from entities with a commercial interest in the treatments we discuss. When we reference secondary sources for context, we trace claims back to their primary research when possible.

Our content draws on guidance and research from the following recognized authorities in sleep medicine and dental sleep medicine:

• American Academy of Sleep Medicine (AASM) — clinical practice guidelines, position papers, and the International Classification of Sleep Disorders.
• American Academy of Dental Sleep Medicine (AADSM) — guidelines for oral appliance therapy and dental sleep medicine practice.
• American Thoracic Society (ATS) — research and guidelines on respiratory and sleep disorders.
• U.S. Food and Drug Administration (FDA) — regulatory clearance information for medical devices.
• National Institutes of Health (NIH) and National Heart, Lung, and Blood Institute (NHLBI) — public health information and research funding.
• Cochrane Library — systematic reviews of healthcare interventions.

We cite research from leading peer-reviewed journals in sleep medicine, respiratory medicine, and dentistry, including:

• New England Journal of Medicine
• The Lancet
• American Journal of Respiratory and Critical Care Medicine
• Sleep
• Journal of Clinical Sleep Medicine
• Chest
• Journal of Dental Research
• Journal of the American Dental Association

Not all research is equal. When evaluating studies and incorporating findings into our content, we consider:

• Study design — randomized controlled trials provide stronger evidence than observational studies.
• Sample size — larger studies generally provide more reliable results than smaller ones.
• Peer review — we prioritize research published in peer-reviewed journals over preprints or non-peer-reviewed sources.
• Reproducibility — findings replicated across multiple studies are more reliable than single-study results.
• Conflict of interest — we are cautious about research funded by entities with a commercial stake in the results.
• Recency — we prefer the most current evidence while acknowledging foundational studies that remain relevant.

We cite our sources within the content itself, referencing the study, guideline, or authority that supports each significant claim. Where appropriate, we include specific study names (such as the Wisconsin Sleep Cohort Study or the STAR Trial) so readers can locate the original research.

We do not use inline footnotes or reference lists on every page, as our content is written for patients rather than clinicians. However, we name the sources of our key claims, and we encourage readers who want deeper detail to search for the referenced studies or guidelines using the names we provide.

Science is an evolving process. We acknowledge the limitations of existing evidence rather than presenting preliminary findings as settled science. When research is ongoing, when findings are mixed, or when evidence is limited to specific populations, we say so.

For example, we note that while oral appliance therapy has strong evidence for mild to moderate obstructive sleep apnea, the evidence for severe OSA is more nuanced. We do not overstate effectiveness or minimize risks.

Sleep medicine is an active field of research. New studies, updated guidelines, and regulatory changes occur regularly. We monitor these developments and update our content accordingly. Each page displays review dates so readers can assess how current the information is. For a patient-friendly companion to this page — how to read the studies behind these standards — see our Research & Evidence Center.

If you are aware of new research that should be reflected in our content, or if you believe any citation is inaccurate, please contact us through our contact page.