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Positional obstructive sleep apnea (POSA) is highly prevalent and characterized by lower BMI and a more favorable sleep and oxygenation profile independent of AHI.

In a retrospective analysis of 12,036 OSA patients, 66.3% had POSA and 27.8% had supine-exclusive POSA. Compared to non-POSA, POSA patients had lower AHI (24.1 vs. 44.4 events/h), lower BMI (29.2 vs. 31.4 kg/m²), and after adjustment for AHI, showed shorter sleep latency, higher sleep efficiency, greater N3 proportion, improved oxygenation, and lower arousal index, with differences more pronounced at lower AHI levels.

Last updated: Jul 7, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score34/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Analysis of positional obstructive sleep apnea features in 12,000 patients at a sleep center.

observational

Rosa CFA, Chillcce KAS, Cahali MB, Boldt MS, Soares VHD, Rosa OA, Passos PHV, Alves MRS, Minniti EGO, Rodrigues JE, Ribas GRW · Sleep & breathing = Schlaf & Atmung (2026)

Participants: N/A
Duration: 6 years (September 2017–August 2023)
Intervention: Classification of OSA patients as POSA or non-POSA based on supine vs. non-supine AHI ratio.
Outcome: Prevalence of POSA, AHI, BMI, sleep architecture (sleep efficiency, N3 proportion, REM latency), oxygenation (mean SpO₂, T90), and arousal index.
Effect Size: N/A
Population: 12,036 patients with obstructive sleep apnea undergoing polysomnography at a sleep center (September 2017–August 2023).

Result:

PubMed: 42400703DOI: 10.1007/s11325-026-03755-3

Mechanism Graph

Supine sleep position exacerbates upper airway collapse in susceptible individuals
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POSA patients have lower BMI and less severe OSA
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Lower AHI leads to better sleep architecture and oxygenation
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Result: POSA is associated with a more favorable sleep and oxygenation profile, especially in milder disease

Limitations

  • ⚠Retrospective study design limits causal inference
  • ⚠Single sleep center data may not be generalizable to other populations
  • ⚠Potential selection bias due to referral patterns

Frequently Asked Questions

What is the prevalence of positional obstructive sleep apnea (POSA)?▼

In this study of 12,036 OSA patients, 66.3% had POSA and 27.8% had supine-exclusive POSA.

How does POSA differ from non-POSA in terms of BMI and AHI?▼

POSA patients had significantly lower BMI (29.2 vs. 31.4 kg/m²) and lower AHI (24.1 vs. 44.4 events/h) compared to non-POSA patients.

Is POSA more common in men or women?▼

No sex differences were observed for POSA overall, but supine-exclusive POSA was more frequent in women.

Does POSA overlap with REM-related OSA?▼

Yes, 32.0% of POSA patients had REM OSA, and nearly 70% of REM OSA patients exhibited POSA, showing an asymmetric overlap.

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References

  1. 1.Rosa CFA, Chillcce KAS, Cahali MB, Boldt MS, Soares VHD, Rosa OA, Passos PHV, Alves MRS, Minniti EGO, Rodrigues JE, Ribas GRW. "Analysis of positional obstructive sleep apnea features in 12,000 patients at a sleep center.." Sleep & breathing = Schlaf & Atmung, 2026. PMID: 42400703 DOI: 10.1007/s11325-026-03755-3
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.