Sleep apnea: the hidden epidemic

70–80% undiagnosed. 90–95% among women. ~1 billion people.

Apnea means you stop breathing at night. It doesn't always wake you up — that's the problem — but it is highly associated with long-term death risk, cognitive function, mood regulation, performance, recovery and metabolic health. In one 10-year cohort, untreated severe apnea tripled cardiovascular events.

Prevalence: roughly 26% of men and 9–17% of women aged 30–70; ~936 million adults worldwide. In the classic Wisconsin cohort ~82% of men and ~93% of women with moderate-to-severe apnea were undiagnosed — the figures Galpin quotes.

Why it's missed: you picture apnea as something that happens to big people. Women are less likely to complain and more likely to attribute symptoms to hormones, cycles, cognitive load or motherhood. Snoring is a strong indicator but not required.

Causes are broader than neck size: as body fluid volume increases, lying down shifts fluid into the neck (the tipped-glass effect — measured directly in non-obese men); there are also neural, positional and 'loop gain' phenotypes. Treatment is moving from generic (medication, CPAP, oral appliance) toward precision matched to your phenotype.

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Educational summary of published research, not medical advice. Screening scores are not diagnoses. If a score is elevated or you feel unwell, talk to a clinician.