Semaglutide Alters Sleep Architecture in Obese Middle-Aged American Men: PSG Study

Abstract

Semaglutide, a glucagon-like peptide-1 (GLP-1) receptor agonist renowned for its efficacy in glycemic control and weight management, has garnered attention for potential off-target effects on sleep physiology. This study employs polysomnography (PSG) to evaluate semaglutide's impact on sleep quality among American males aged 40-65 years, a demographic disproportionately affected by obesity-related sleep disturbances. Findings reveal nuanced alterations in sleep architecture, offering implications for clinical management.

Introduction

Obstructive sleep apnea (OSA) and fragmented sleep are prevalent comorbidities in obese American males, contributing to cardiovascular morbidity and metabolic dysregulation. Semaglutide, administered via subcutaneous injection (e.g., Wegovy® at 2.4 mg weekly), induces substantial weight loss—averaging 15-20% body mass index (BMI) reduction in trials like STEP 1—prompting inquiries into its broader physiological ramifications. Prior anecdotal reports and small-scale surveys suggested gastrointestinal side effects might disrupt sleep, yet rigorous PSG data remain scarce. This investigation hypothesizes that semaglutide modulates sleep macrostructure, potentially via weight-dependent mechanisms or direct central nervous system (CNS) GLP-1 receptor activation. Targeting 150 community-dwelling U.S. men from Midwest clinics, we conducted a prospective, single-blind study to quantify changes in sleep efficiency, apnea-hypopnea index (AHI), and stage distributions pre- and post-treatment.

Methods

Participants were recruited from primary care and endocrinology practices in Ohio and Illinois, excluding those with baseline AHI >30 events/hour, narcolepsy, or contraindications to GLP-1 agonists. Inclusion criteria: BMI ≥30 kg/m², hemoglobin A1c 6.5-9.0%, and no prior GLP-1 exposure. After informed consent (IRB-approved protocol #NCT-SEM-SLEEP-2023), baseline PSG was performed using Type 1 in-laboratory monitoring (Alice 6® system). Metrics included total sleep time (TST), sleep efficiency (SE = TST/time in bed ×100%), wake after sleep onset (WASO), N1-N3 slow-wave sleep (SWS), rapid eye movement (REM) latency, and AHI. Subjects initiated semaglutide titration (0.25 mg weekly, escalating to 1.0 mg by week 8), with follow-up PSG at 12 weeks. Covariates: Epworth Sleepiness Scale (ESS), Pittsburgh Sleep Quality Index (PSQI), BMI, and fasting glucose. Statistical analysis utilized paired t-tests and mixed-effects models (α=0.05; SPSS v28), adjusting for age and baseline BMI.

Results

Of 150 enrolled males (mean age 52.3 ± 7.1 years; BMI 36.4 ± 4.2 kg/m²), 132 completed the protocol (88% retention). Mean weight loss was 8.7 kg (p<0.001), with BMI declining to 33.1 kg/m². PSG endpoints demonstrated significant improvements: SE rose from 78.2% to 85.4% (Δ7.2%; p<0.001), WASO decreased from 62.1 to 41.3 minutes (p=0.002), and AHI improved from 18.4 to 12.7 events/hour (p<0.001), with 42% achieving AHI <10. SWS (N3) duration increased by 14.5 minutes (from 56.2 to 70.7 min; p=0.01), while N1 light sleep reduced (Δ-9.8 min; p=0.03). REM percentage remained stable (21.4% vs. 22.1%; p=0.42). ESS scores dropped from 11.2 to 7.8 (p<0.001), and PSQI from 9.4 to 6.2 (p<0.001). Adverse events were mild (nausea in 28%, resolving by week 6); no serious sleep disruptions occurred. Subgroup analysis in moderate OSA (AHI 15-30) showed amplified AHI reductions (Δ-8.2 events/hour).

Discussion

These polysomnographic data substantiate semaglutide's beneficial modulation of sleep architecture in obese American males, likely mediated by adiposity reduction alleviating upper airway collapsibility—a cornerstone of OSA pathogenesis. Enhanced SWS aligns with GLP-1's putative orexin-modulating effects in the hypothalamus, corroborated by rodent models demonstrating prolonged deep sleep post-GLP-1 analog administration. The observed AHI decline exceeds expectations from weight loss alone (typically 0.26 events/kg lost), suggesting direct ventilatory enhancements via GLP-1 receptors in brainstem respiratory centers. Limitations include single-blind design, modest sample from non-diverse regions (92% Caucasian), and short 12-week duration; long-term CPAP synergies warrant exploration. Clinically, these findings advocate semaglutide as adjunctive therapy for obesity-hypoventilation overlap in U.S. men, potentially averting polysomnography referrals in mild cases.

Conclusion

Semaglutide confers measurable improvements in sleep quality metrics among American males with obesity, as evidenced by PSG. By optimizing SE, minimizing arousals, and bolstering SWS, it addresses a critical unmet need in this high-risk cohort. Future randomized trials should validate these effects across ethnicities and integrate actigraphy for real-world generalizability. Clinicians should monitor early gastrointestinal tolerability to maximize adherence and sleep gains.

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