Types of Sleep Disorders
A complete guide to every major category of sleep disorder — from insomnia and sleep apnea to rare conditions like narcolepsy and REM sleep behavior disorder.
Sleep disorders are officially classified into more than 80 distinct conditions by the International Classification of Sleep Disorders (ICSD-3). While that sounds overwhelming, the most clinically significant disorders fall into a handful of well-understood categories — each with its own causes, symptoms, and treatment pathways.
Understanding which type of disorder you or a loved one may be experiencing is the first step toward effective treatment. Use the guides below to learn about each condition in depth. For help identifying your specific symptoms, visit our symptoms guide. To understand how a diagnosis is made, see how sleep disorders are diagnosed.
All Sleep Disorder Types
Chronic vs. acute insomnia, onset vs. maintenance, and the evidence-based treatments that work.
Obstructive vs. central sleep apnea, risk factors, symptoms, and CPAP therapy.
The urge to move, evening worsening, dopamine connection, and available treatments.
Understanding cataplexy, sleep attacks, and hypocretin deficiency.
When your internal clock is out of sync — DSPD, ASPD, jet lag, and shift work disorder.
An umbrella guide to NREM and REM parasomnias — and when they need medical attention.
Why people walk in their sleep, common triggers, and how to keep sleep environments safe.
How night terrors differ from nightmares, who they affect, and how to manage them.
Acting out dreams during sleep — symptoms, Parkinson's link, diagnosis, and treatment.
What causes the inability to move during sleep, and why hallucinations sometimes occur.
Primary hypersomnia vs. secondary causes, and how it is managed.
How irregular work hours disrupt circadian rhythms and what shift workers can do.
Crossing time zones, why east travel is harder, melatonin, and recovery strategies.
Repetitive limb movements during sleep — how they differ from RLS and how they are treated.
The link between stress, jaw pain, dental damage, and nighttime teeth grinding.
Brain signaling failures, Cheyne-Stokes respiration, and treatment including ASV therapy.
The most common form of sleep apnea — anatomy, risk factors, CPAP, and surgery.
Excessive sleep need without a known cause — distinguishing it from narcolepsy.
The full taxonomy of circadian disorders and light-based treatment approaches.
Clinical distinctions between parasomnias and nightmare disorder, and treatment differences.