Herbie Murray
The Apple Watch has a Sleep app that allows users to track their sleep and monitor sleep patterns. The app categorises sleep into four stages: REM, Core, Deep, and Light sleep. The watch uses motion detection, an accelerometer, a heart rate sensor, and a blood oxygen sensor to approximate the different stages of sleep. The Sleep app also allows users to set sleep schedules, create sleep goals, and limit distractions before bedtime.
| Characteristics | Values |
|---|---|
| Sleep tracking | Available on watchOS 8 or later |
| Sleep schedules | Can be created to help meet sleep goals |
| Sleep tracking requirements | Apple Watch must be enabled and worn for at least 1 hour each night |
| Sleep data | Includes time and percentage spent awake or in REM, Core, or Deep sleep |
| Sleep Focus | Turns off the watch display and limits distractions before the scheduled bedtime |
| Sleep tracking accuracy | Based on accelerometer, heart rate sensor, and blood oxygen sensor |
| Sleep tracking duration | Tracks sleep for the past 14 days |
| Sleep tracking charging | Requires at least 30% charge before bed |
| Sleep tracking tips | Ensure a comfortable fit to avoid registering too much movement |
| Sleep tracking stages | N1, N2, N3, and REM |
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What You'll Learn
Sleep tracking
The Sleep app on the Apple Watch allows users to create personalized sleep schedules, with options to set bedtime and wake-up times, and customize alarm options. Additionally, the Sleep Focus feature simplifies the Lock Screen and limits distractions before the scheduled bedtime. Users can also set Charging Reminders to ensure their watch is charged before their wind-down time.
After a night's sleep, users can open the Sleep app to view their sleep data, including the time spent in each sleep stage and their sleep trends over the past 14 days. This information can also be accessed through the Health app on the iPhone or iPad, where users can view their sleep history and additional sleep details.
It is important to note that the Apple Watch's sleep tracking feature may not always accurately distinguish between the specific sleep stages. While it is good at differentiating between being asleep and awake, there may be miscategorizations between light and deep sleep. Therefore, while it provides valuable insights into sleep patterns, making significant routine changes based solely on these data points may not be advisable.
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Sleep stages
Core sleep, also known as light sleep, corresponds to the non-REM stages 1 and 2 of sleep. During this stage, individuals are considered to be in a light sleep state, with their body beginning to relax and brain wave patterns differing from those observed during wakefulness.
Deep sleep, also known as N3 sleep, is the third stage of non-REM sleep. This stage is characterized by deeper sleep, with individuals spending about 25% of their total sleep time in this state.
REM sleep, also known as rapid-eye movement sleep, is the fourth stage of sleep. This stage is associated with increased brain activity, eye movements, and dreaming.
The Apple Watch uses an accelerometer, heart rate sensor, and blood oxygen sensor to approximate an individual's sleep stage at a given time. This data can be viewed through the Sleep app on the Apple Watch or the Health app on the iPhone, providing insights into the duration and quality of sleep.
It is important to note that the Apple Watch's categorization of sleep stages may not always align perfectly with the scientific understanding of sleep stages, and there can be variations in the data. However, it still provides a useful estimate of sleep patterns and can help individuals track their sleep habits over time.
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Sleep schedules
The Sleep app on the Apple Watch allows users to create sleep schedules to help them meet their sleep goals. Users can wear their watch to bed, and the Apple Watch can estimate the time spent in each sleep stage—REM, Core, and Deep—as well as when the user woke up. The Sleep app also shows the user how much sleep they got and their sleep trends over the past 14 days.
To create a sleep schedule, users can set a sleep goal, which is the number of hours they would like to sleep. They can also set their bedtime and wake-up times. Additionally, users can turn on Sleep Focus, which limits distractions before bedtime and protects sleep after the user is in bed. Sleep Focus turns off the watch display and can be turned on manually or set to turn on automatically at the wind-down time set in the Sleep app. Users can also set reminders to charge their Apple Watch before their wind-down time and choose an alarm sound.
Users can create multiple sleep schedules, such as one for weekdays and another for weekends. They can also turn off their sleep schedule as needed and make changes to their full schedule or just for the next day. If the user wakes up before their scheduled wake-up time, they can exit Sleep Focus by pressing and holding the Digital Crown to unlock the Apple Watch and then pressing the side button to open the Control Center.
It is important to note that the Apple Watch must be charged to at least 30% before bed with Sleep Tracking enabled, and users should wear their Apple Watch for at least one hour each night to receive sleep data. The Sleep Tracking feature is available on watchOS 8 or later, and users can view their sleep history on their iPhone or iPad through the Health app.
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Sleep Focus
To enable Sleep Focus, go to the Sleep app on your Apple Watch and create a sleep schedule by setting your bedtime and wake-up times. Then, tap your schedule and turn on "Active On" for the days you want Sleep Focus to be active. You can also adjust your alarm settings and choose to have the Sleep Focus start automatically at your wind-down time.
If you prefer to control Sleep Focus manually, you can turn off the automatic option. To manually turn on Sleep Focus, press the Digital Crown to access the watch face, then press the side button to open the Control Center. From there, you can tap to enable Sleep Focus.
It's important to note that to receive sleep data, you must wear your Apple Watch for at least one hour each night. Additionally, ensure your Apple Watch is charged to at least 30% before bed to avoid running out of battery during sleep tracking.
By using Sleep Focus in conjunction with the Sleep app, you can track your sleep patterns, set sleep goals, and make adjustments to improve your overall sleep quality and health.
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Sleep data
To receive sleep data, users must enable "Track Sleep with Apple Watch" and wear the watch for at least one hour each night. If the watch is too loose, the accelerometer may register too much movement during natural sleep, so it is important to ensure a comfortable fit. Charging reminders can be turned on to remind users to charge their watch before their wind-down time and notify them when it is fully charged.
The Apple Watch divides sleep into three categories: Core, Deep, and REM sleep. These categories are based on the well-known sleep cycle, which consists of cycles lasting about 90 minutes, with each cycle containing four stages. While the Apple Watch cannot distinguish between N1 and N2 sleep, it combines them into Core sleep. N3 sleep corresponds to Deep sleep, and REM sleep remains unchanged.
The SleepWatch app also offers a Beta version of REM and Deep Sleep Tracking for Apple Watch Series 4 or newer. This feature requires users to enable "Sleep Focus" on their Apple Watch before going to sleep and disable it upon waking up to access their SleepWatch report. The Beta mode provides a sleep pattern graph that visualizes sleep stages, including REM, Deep, and Light Sleep.
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Frequently asked questions
REM is one of the four stages of sleep, along with N1 and N2 (Core sleep) and N3 (Deep sleep).
The Apple Watch uses its accelerometer, heart rate sensor, and blood oxygen sensor to approximate your sleep stages.
First, ensure your Apple Watch is charged to at least 30% before going to bed. Then, wear your Apple Watch to bed for at least one hour. You can also enable "Sleep Focus" on your Apple Watch Control Center to ensure your sleep gets tracked.
Open the Sleep app on your Apple Watch to see the amount of sleep you got the night before, the time spent in each sleep stage, and your sleep average over the last 14 days. You can also view your sleep history on your iPhone or iPad by opening the Health app and tapping "Browse" at the bottom of the screen.
The amount of sleep you should aim for each night depends on your personal sleep goals. You can set a sleep goal on your Apple Watch by creating a personalized sleep schedule to help you meet your goals and improve your overall health.
