Practical guides on sleep, blood oxygen and pulse oximetry — how to read your overnight data and use it to sleep better.
The Oxygen Desaturation Index is the single number that best summarizes your night of breathing. Here's what it counts, what a normal ODI looks like, and how to read yours.
Your pulse doesn't switch off when you fall asleep - it tells a detailed story about how well you're actually resting. Here's how to read overnight heart rate and the CVHR pattern.
Pulse oximeters are accurate - until they aren't. Cold hands, nail polish, movement, and skin tone can all skew a reading. Here's how to spot a bad number and record clean overnight data.
Your blood oxygen falls as you go up - and it can drop further while you sleep. Here's what happens to SpO₂ at altitude, what's normal, and how to track your adjustment safely.
Not all snoring is sleep apnea, and not all apnea is loud. Here's how overnight blood oxygen and heart-rate data help you tell ordinary snoring from something worth investigating.
Your blood oxygen and pulse tell a story about your nights. Here's how an overnight pulse oximeter reveals what's quietly disrupting your sleep — and what to do about it.