Respiratory event index

W8MD Health Glossary • Greater NYC

The respiratory event index, or REI, is the number of respiratory events divided by monitoring time in many home sleep studies. It may underestimate severity when wake time is included.

W8MD sleep medicine and home sleep study services in NYC
W8MD Weight Loss, Sleep & MedSpa • Brooklyn, New York
Definition

Respiratory event index — The respiratory event index, or REI, is the number of respiratory events divided by monitoring time in many home sleep studies. It may underestimate severity when wake time is included.

Why it matters for sleep and weight

Sleep disorders can affect alertness, cardiovascular health, appetite and weight-management efforts. Symptoms and device data should be interpreted by a qualified clinician.

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Related W8MD and encyclopedia resources

Medical disclaimer: This glossary definition is general education, not a diagnosis or individualized treatment recommendation. Do not start, stop or combine medication or supplements without appropriate medical guidance. Call 911 for an emergency. Editorial review: August 2026.