The apnea-hypopnea index (AHI) is a scale that tells whether you have a sleep disorder called apnea and, if so, how serious it is. Sleep apnea is when you stop breathing for 10 seconds or more ...

You may have heard of sleep apnea. It’s a common disorder that affects about 39 million American adults. But you may not be familiar with its cousin, hypopnea. Apnea and hypopnea are different ...