Sleep Apnea and Breathing Disorders Explained

Last updated: June 2026 - Reviewed by the Apexzen editorial team

Part of: The Complete Atlas of Sleep Disorders

What are sleep-related breathing disorders? These are conditions in which breathing becomes abnormal during sleep. Breathing may slow, become shallow, or stop briefly and repeatedly through the night, often without the sleeper being aware. The result is fragmented sleep and, frequently, daytime sleepiness. They are medical conditions, not habits to be fixed with a supplement.

The main breathing disorders

Obstructive sleep apnea (OSA) is the most common. The airway repeatedly narrows or collapses during sleep, causing pauses in breathing and drops in oxygen, usually with loud snoring and gasping. It is the central example of this category. Read the full guide to obstructive sleep apnea.

Central sleep apnea (CSA) is different in cause: instead of the airway blocking, the brain briefly fails to send the signal to breathe. It is less common than OSA and is often linked to other medical conditions, so it needs careful specialist assessment.

Upper airway resistance syndrome (UARS) sits on a spectrum with OSA. Breathing is partially restricted enough to fragment sleep and cause daytime tiredness, but without the full pauses seen in apnea, which can make it harder to spot.

Snoring alone is common and is often harmless, but loud or persistent snoring can be a warning sign of underlying apnea. Because snoring can mask a more serious condition, it is worth raising with a doctor rather than ignoring.

Sleep-related hypoventilation is when breathing is too shallow to clear carbon dioxide properly during sleep. It is a clinical condition usually tied to other health factors and always requires medical evaluation.

How they are diagnosed and treated

Diagnosis relies on a sleep study, either overnight in a lab or with a home sleep test, which records breathing, oxygen levels, and sleep stages. Treatment depends on the condition and its severity. For obstructive sleep apnea, CPAP therapy is the standard and highly effective option; other approaches include positional therapy, oral appliances, weight management, and in some cases surgery. These are medical decisions made with a clinician.

When to see a doctor

See a doctor if you snore loudly, if a partner notices you gasp or stop breathing during sleep, if you wake unrefreshed despite enough hours in bed, or if you feel persistently sleepy during the day. Untreated breathing disorders carry real health risks, so they are not conditions to manage on your own. A sleep study is the way to get a clear answer.

Related reading: Obstructive Sleep Apnea and the full Atlas of Sleep Disorders.

Sources: American Academy of Sleep Medicine, International Classification of Sleep Disorders, 3rd ed. (ICSD-3); AASM guidance on diagnosis and treatment of obstructive sleep apnea.

This article is for educational purposes only and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. Apexzen products are not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare provider for persistent sleep problems or suspected sleep apnea.