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.

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.
Local, physician-supervised care
W8MD provides medical weight loss, GLP-1 evaluation, sleep medicine, home sleep studies, IV/IM nutrition and medical aesthetic services at 2632 East 21st Street, Suite L3, Brooklyn, NY 11235.
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