Sleep medicine has moved beyond CPAP: What primary care physicians should know

Sleep medicine is no longer only about diagnosing obstructive sleep apnea and prescribing continuous positive airway pressure (CPAP). Primary care physicians including family physicians and general internists increasingly need a broader, structured approach to excessive daytime sleepiness, insomnia, circadian rhythm disorders, restless legs syndrome, hypersomnia and sleep-disordered breathing. These are considered “the big 6” in terms of what everyone involved in primary care should know about.The problem physicians see every day: Patients present every day with fatigue, poor sleep, brain fog, impaired concentration, mood symptoms, cardiometabolic risk or excessive daytime sleepiness. These are frequent in primary care, but the differential diagnosis is broad. Sleep complaints are common but diagnostically imprecise. Patients often use words such as “tired,” “fatigued,” “sleepy,” “burned out,” or “not sleeping,” and these terms can point to very different clinical entities. The mistake is assuming that all sleep complaints are either insomnia, obstructive sleep apnea, stress or aging. For example: a patient with fatigue may have depression, hypothyroidism, iron deficiency, medication effects, insomnia, circadian misalignment, obstructive sleep apnea (OSA), restless legs syndrome, narcolepsy, idiopathic hypersomnia, insufficient sleep, or shift-work disorder.Sleep medicine is broader than OSA: In many communities, sleep care has historically been organized around obstructive sleep apnea testing and CPAP provision. That remains important, but it is not the whole field of sleep medicine. In fact there are over 85 sleep disorders recognized by the International Classification of Sleep Disorders – III guide. The major domains physicians should keep in mind include: Sleep-disordered breathing, including OSA and central sleep apnea; insomnia disorder; circadian rhythm sleep-wake disorders; restless legs syndrome and periodic limb movements; central disorders of hypersomnolence such as narcolepsy and idiopathic hypersomnia; and parasomnias when clinically relevant.Home sleep apnea testing (HSAT) is useful, but not universal: The gold standard for diagnosing and managing sleep disorders is a consultation with a sleep specialist followed by a monitored level I polysomnogram in an accredited sleep laboratory. But this is not necessary for everyone and definitely not necessary to diagnose most cases of obstructive sleep apnea. Home sleep apnea testing has improved access for appropriately selected adults with suspected moderate-to-severe OSA. However, it is not a general sleep test, and it does not evaluate “sleep”—therefore cannot be used to assess insomnia, circadian disorders, narcolepsy, idiopathic hypersomnia, parasomnias, or many causes of non-restorative sleep.What primary care physicians can do before referral: In terms of practical clinical advice, a suggested checklist to be used by primary clear physicians when assessing their patients with potential sleep disorders is important. Ask separately about:sleepiness versus fatiguesleep duration and schedulesnoring, witnessed apneas, nocturnal choking, hypertension, atrial fibrillation, obesity and cardiometabolic riskinsomnia symptoms and conditioned arousalrestless legs symptoms and ferritin/iron statusmedications, alcohol, cannabis, sedatives, stimulants, antidepressants, and antihistaminesshift work, delayed sleep phase, irregular schedules, and light exposurered flags such as sleep attacks, cataplexy, parasomnia-related injury, drowsy driving, or treatment-resistant sleepinessWhy better diagnosis matters: We know that sleep issues are pervasive. A recent study in the journal Sleep Health in 2022 suggested that untreated sleep disorders and general sleep deprivation costs the Canadian economy up to $21.4 billion annually in macroeconomic losses, representing roughly 1.35% of the nation's gross domestic product. When looking specifically at diagnosed clinical sleep disorders and peer-reviewed data from the Economic Burden of Illness in Canada, the economic toll is divided into direct healthcare costs and indirect productivity losses. Breakdown by condition:Insomnia symptoms: A comprehensive economic evaluation published in Sleep Health outlines the significant financial drain of insomnia: Total annual cost: $1.9 billion. Per-person burden: Individual economic costs reach $5,010 per person per year for those with severe insomnia syndrome, with 90% driven by absenteeism and reduced workplace performance. Comorbidity drivers: The healthcare costs are heavily driven by secondary chronic diseases caused or worsened by insomnia. The two most expensive are type 2 diabetes ($754 million) and depression ($706 million).Insufficient sleep duration and general sleep deprivation: For adults consistently sleeping less than the recommended minimum hours: Direct healthcare cost: $502 million annually specifically to manage illnesses tied to short sleep cycles. Comorbidity drivers: Short sleep duration triggers major healthcare expenses for depression ($219 million) and type 2 diabetes ($92 million). Workplace Impact: General sleep deprivation accounts for roughly 78,000 lost working days across Canada every year.Obstructive sleep apnea: While a unified Canadian-specific dollar figure for OSA is less frequently isolated than insomnia, economic briefs utilized by provincial health ministries (such as the B.C. Ministry of Health) highlight massive impacts: Healthcare multiplier: Patients with untreated OSA incur approximately 2.5 times higher annual healthcare costs compared to those without the condition due to cardiovascular events, stroke risks, and severe daytime fatigue. Accident risks: Drowsy driving caused by untreated sleep apnea is implicated in roughly 20% of serious motor vehicle accidents across Canada.Economic savings potential—Epidemiological modeling demonstrates that even minor population-level improvements would yield massive savings. For example, a modest 5% reduction in the prevalence of insomnia and sleep deprivation would save the Canadian healthcare system over $500 million annually in avoided expenditures.Modern sleep care should be integrated and community-based: The future of sleep medicine in Canada is likely to be more distributed, with appropriate use of virtual care (telemedicine), more accurate home-based testing, community sleep clinics, longitudinal follow-up, and collaboration between family physicians, sleep physicians, respiratory therapists, psychologists, dentists and technologists. The Royal College of Physicians and Surgeons in Canada now has an area of focused competence in sleep medicine, equivalent to the American Academy of Sleep Medicine fellowship and the European somnology designation. And CPAP provider companies are pivoting to become more facile and multidisciplinary by assisting primary care physicians in the management of insomnia, restless legs and other suitable sleep disorders in addition to treating obstructive sleep apnea.In Closing: For primary care physicians, the key shift is to treat sleep complaints as diagnostic problems rather than lifestyle complaints. When the phenotype is clarified, the treatment becomes more rational, more personalized and more likely to improve daytime function and long-term health.Dr. Alan Hoffman is national medical director of Resolve Sleep Health, a CPAP provider company. Disclosures: He works with the College of Physicians and Surgeons of British Columbia in their diagnostic accreditation program and sits on the polysomnography advisory committee. He was a contributor to the recent CDA Rapid Technology Assessment on HSAT technology, and will be working with the incoming Canadian Sleep Society executive and technical team with regards the modernization of in-lab and home-based sleep diagnostic equipment categories/tiers.

Sleep medicine has moved beyond CPAP: What primary care physicians should know

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