What Your Nighttime Breathing Says About Your Health

For decades, sleep disturbance was a punch line: the cartoon dad snoring, the disgruntled partner burying their head under a pillow. But science is beginning to paint a less jovial picture. Sleep apnea—a relatively common disorder where breathing repeatedly stops and starts during sleep—is now being taken seriously as a potential biomarker for a host of major health conditions, from cardiovascular disease to Alzheimer’s, even anxiety and depression.

“Sleep is just as important for health as diet and exercise,” says Marishka Brown, director of the US National Center on Sleep Disorders Research. “Poor sleep affects both your mental and physical health; it contributes to cardiovascular disease, increases all-cause mortality, and raises risk factors like obesity, hypertension, and diabetes. And these impacts are independent—they’re not just knock-on effects from something else. Sleep is foundational.”

Obstructive Sleep Apnea (OSA) is one of the most common types of apnea, affecting an estimated 1 billion people worldwide. It occurs when the upper airway repeatedly collapses during sleep, interfering with breathing and lowering oxygen levels. The brain responds by jolting the sleeper awake—sometimes hundreds of times a night—before letting them drift off again, often unaware.

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