Like alcohol, a stuffy nose may make it more difficult for you to breathe at night. “Alcohol before bed may cause breathing irregularities that can result in a decline in blood oxygen levels,” says Winter.Īnother possibility: You have an upper respiratory infection. In one study, participants who had a nightcap 30 minutes before bed, experienced aggravated sleep apnea symptoms ( 3 ). If you had a nightcap, it can show up in your readings. Situation #1: Your normal average oxygen level during sleep is usually above 95+, but lately, it has trended downward. Here we explore what SpO2 numbers mean, what normal oxygen levels are during sleep, and what to do if they dip. Why bother? As it turns out, your blood oxygen levels-especially during sleep-can serve as an early warning system, alerting you about potential or silent health problems like sleep apnea or chronic breathing issues that can cause you health problems now and shorten your healthspan. These devices use infrared light to take repeated blood oxygen readings 24/7, assembling the data points into graphs that illuminate trends over time. The Apple Watch, Garmin fēnix, and Oura Ring (among others) have added blood oxygen saturation level (also called peripheral capillary oxygen saturation or SpO2)-sensing to the long list of health metrics their smart wearables can track. But in the past few years they’ve become a staple on wearable trackers. Pulse oximeters used to be something you only saw at a doctor’s office or hospital to measure the saturation of oxygen in your red blood cells (they’re those gizmos that clamp onto your index finger and give off an E.T.-like red glow).
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