Poor sleep is common. Sleep disorders are something different — persistent, diagnosable conditions that impair health and quality of life and require specific treatment. Understanding the difference between a rough patch of sleep and a clinical sleep disorder is the first step toward getting appropriate help.
Insomnia
Insomnia is the most common sleep disorder, affecting roughly 10-15% of adults chronically and up to 30% at any given time. It is defined as difficulty falling asleep, staying asleep, or waking too early, occurring at least three nights per week for at least three months, despite adequate opportunity for sleep, and causing daytime impairment.
Types of Insomnia
Sleep-onset insomnia involves difficulty falling asleep at the start of the night. Sleep-maintenance insomnia involves waking during the night and struggling to return to sleep. Early morning awakening insomnia involves waking significantly earlier than desired and being unable to return to sleep. Many people experience combinations of these.
What Causes Chronic Insomnia
Acute insomnia — triggered by stress, illness, or life events — is normal and usually resolves on its own. Chronic insomnia typically involves a perpetuating factor that keeps it going after the original trigger has resolved. The most common perpetuating factor is conditioned arousal: the bed and bedroom become associated with wakefulness and frustration rather than sleep, creating a self-reinforcing cycle.
Treatment: CBT-I Is First Line
Cognitive Behavioral Therapy for Insomnia (CBT-I) is the most effective treatment for chronic insomnia and is recommended as first-line treatment over sleep medication by every major sleep medicine organization. It addresses the behavioral and cognitive factors that perpetuate insomnia through sleep restriction therapy, stimulus control, and cognitive restructuring. Multiple meta-analyses show CBT-I produces larger and more durable improvements than sleep medication, with no side effects or dependency risk.
Obstructive Sleep Apnea
Obstructive sleep apnea (OSA) affects an estimated 1 billion people worldwide, with the majority undiagnosed. It occurs when the upper airway repeatedly collapses during sleep, causing breathing pauses (apneas) that last 10 seconds to over a minute. Each apnea causes a brief arousal that fragments sleep, even when the person has no memory of waking.
Symptoms
- Loud snoring (though not all snorers have apnea, and not all apnea patients snore)
- Witnessed breathing pauses during sleep
- Gasping or choking during sleep
- Excessive daytime sleepiness despite adequate time in bed
- Morning headaches
- Difficulty concentrating, memory problems
- Waking with dry mouth or sore throat
Health Consequences
Untreated OSA significantly increases the risk of hypertension, cardiovascular disease, stroke, type 2 diabetes, and depression. The repeated oxygen desaturations and sleep fragmentation drive systemic inflammation and metabolic dysregulation. OSA is also a major cause of motor vehicle accidents due to daytime sleepiness.
Diagnosis and Treatment
OSA is diagnosed with a sleep study — either in a sleep lab (polysomnography) or at home with a home sleep apnea test. CPAP (continuous positive airway pressure) therapy is the most effective treatment, delivering pressurized air through a mask to keep the airway open. Alternatives for mild-to-moderate OSA include oral appliances (mandibular advancement devices) and positional therapy for position-dependent apnea.
Restless Legs Syndrome
Restless legs syndrome (RLS) affects 5-10% of adults and is characterized by an irresistible urge to move the legs, typically accompanied by uncomfortable sensations described as crawling, tingling, or aching. Symptoms are worse at rest and in the evening, and are temporarily relieved by movement. RLS significantly disrupts sleep onset and is associated with iron deficiency, pregnancy, kidney disease, and certain medications.
When to See a Doctor
Seek medical evaluation for sleep problems when:
- Sleep difficulties have persisted for more than three months despite good sleep hygiene
- You snore loudly or have been told you stop breathing during sleep
- You experience excessive daytime sleepiness that impairs functioning or creates safety risks
- You have uncomfortable sensations in your legs that disrupt sleep onset
- Sleep problems are significantly affecting your mood, relationships, or work performance
A primary care physician can conduct an initial evaluation and refer to a sleep specialist when indicated. Sleep medicine is a recognized subspecialty with board certification — for complex or treatment-resistant sleep disorders, a specialist evaluation is worthwhile.