The HypnoLaus study, a population-based investigation in Switzerland, found that sleep-disordered breathing (SDB) is highly prevalent in the general population, with 23.4% of women and 49.7% of men having moderate-to-severe SDB (≥15 events per hour of apnoea-hypopnoea index). This prevalence is higher than previously reported, likely due to improved recording techniques and updated diagnostic criteria. SDB was independently associated with hypertension, diabetes, metabolic syndrome, and depression, particularly in the highest severity quartile (>20.6 events per hour). The study highlights the need to revise the definition of SDB, as current criteria may underestimate its prevalence. SDB is a significant public health issue, with important implications for cardiovascular, metabolic, and psychiatric health. The findings suggest that SDB should be viewed as a continuous spectrum rather than a binary condition. The study used polysomnography in participants' homes, ensuring accurate data collection and minimizing bias. While the study has strengths, including a large, representative sample and modern recording techniques, limitations include a cross-sectional design and a focus on a specific population. Overall, the results emphasize the importance of identifying high-risk individuals for targeted interventions, such as continuous positive airway pressure (CPAP), and highlight the need for revised diagnostic criteria to better reflect the true prevalence of SDB.The HypnoLaus study, a population-based investigation in Switzerland, found that sleep-disordered breathing (SDB) is highly prevalent in the general population, with 23.4% of women and 49.7% of men having moderate-to-severe SDB (≥15 events per hour of apnoea-hypopnoea index). This prevalence is higher than previously reported, likely due to improved recording techniques and updated diagnostic criteria. SDB was independently associated with hypertension, diabetes, metabolic syndrome, and depression, particularly in the highest severity quartile (>20.6 events per hour). The study highlights the need to revise the definition of SDB, as current criteria may underestimate its prevalence. SDB is a significant public health issue, with important implications for cardiovascular, metabolic, and psychiatric health. The findings suggest that SDB should be viewed as a continuous spectrum rather than a binary condition. The study used polysomnography in participants' homes, ensuring accurate data collection and minimizing bias. While the study has strengths, including a large, representative sample and modern recording techniques, limitations include a cross-sectional design and a focus on a specific population. Overall, the results emphasize the importance of identifying high-risk individuals for targeted interventions, such as continuous positive airway pressure (CPAP), and highlight the need for revised diagnostic criteria to better reflect the true prevalence of SDB.