![]() ![]() It’s great news if Apple’s data truly reveals gold-standard accuracy. How accurate is the new Apple Watch sleep stages feature?Īpple touts its sleep staging algorithm as based on “machine learning models … and validated against the clinical gold standard, polysomnography, or EEG-based classification, with one of the largest and most diverse populations ever studied for a wearable.” That’s an impressive claim, given that data from Fitbit and Oura also showed a robust sampling of more than 500 (if you add up meta-analyses) and 100 people, respectively. ![]() It is best monitored over a period of time (versus looking at a single measurement) in order for it to be a helpful metric in determining the quality of your sleep, including poor sleep and how easily you fall asleep. HRV numbers will also vary by sleep stage, as well as from person to person, depending on your age, gender, and what’s going on in your life. Your HRV tends to be higher at night and lower during the day. HRV can fluctuate a lot throughout the day, depending on your stress levels, hydration, sleeping patterns, as well as changes in your emotions and activities. HRV refers to the variation in time between the beats of your heart, which can provide useful information about your resilience and your body’s adaptability to stress. Example actigraphy report, with the blue regions being movement levels during sleep Compared to polysomnography sleep studies (PSG), actigraphy data is usually more than 80% accurate for most people, and obviously more accessible and lower cost than a sleep study. Accelerometers cannot tell you specifics about sleep stages, but can confirm how long you sleep. Sleep researchers have been using accelerometer data for several years to measure sleep by using actigraphy watches. The deeper the sleep (as you progress from NREM stage 1 to stage 3) the less you’ll move around in your sleep, i.e., less muscle activity. The accelerometer data measures movement, which varies by sleep stage. This data combination is promising for increasing sleep stages and sleep data accuracy, especially for diagnosing insomnia. Traditionally in sleep medicine, sleep stages are REM and Non-REM (non rapid eye movement, or NREM), with the latter divided into three sub-stages (NREM stages 1-3).Īpple is measuring sleep stages using a combination of accelerometer, and heart-rate variability (HRV) data.Ĭombining these metrics has become standard in other sleep tracking wearables like Whoop, Fitbit, and Oura ring. Typical sleep stages during a sleep cycle The newest updates will, according to Apple, improve the Apple Watch's sleep tracking accuracy by further breaking down how much time you spend in 4 different sleep stages (which they’ve termed Awake, REM, Core, and Deep sleep). awake, with few details or other data to help you understand your sleep. Previous versions of the Apple Watch's sleep tracking only included estimates of your time in bed and when you were asleep vs. ![]() The sleep experts from the Crescent team delved into the details, and here’s where we landed. This news sounds great, but if you have an Apple Watch you may be wondering, how good is it at sleep quality assessment? What information will I gain about my sleep, including my deep sleep, from these updates, and how good is the sleep data? If you have Apple Watch Series 8 or Apple Watch Ultra, you can also compare changes in your nightly wrist temperature data.Earlier this month, at Apple’s 2022 Worldwide Developers Conference, the company announced improvements to the Apple Watch OS 9, including the addition of sleep stages to the smartwatch’s Sleep app and tracking capabilities. Comparisons: View your Heart Rate and Respiratory Rate in relation to your time spent asleep.Amounts: View your Sleep Duration details such as Average Time in Bed and Average Time Asleep.Stages: View the time and percentage you spent Awake or in REM, Core, or Deep sleep.Tap Show More Sleep Data and select a category to review additional sleep details. The bar graph by default is set to D for daily. Tap W at the top of the chart to view your sleep history for the past week, M for the past month, or 6M for the past 6 months. If you have Sleep saved as a favorite, you can access it from the Summary page in the Health app. To view your sleep history, open the Health app on your iPhone, tap Browse at bottom of the screen, then tap Sleep. Based on your iPhone usage at night, Sleep on iPhone tracks and charts your Time In Bed. To receive sleep data from Apple Watch, sleep tracking must be enabled for at least 4 hours each night. ![]()
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