Thanks for clarifying! This can be done by going to: Settings > Display & Brightness > Auto-Lock > Then, you can select the time you'd like.
Apple developed a sleep staging classifier algorithm that's based on accelerometer signals derived from Apple Watch. The accelerometer signals contain information about oscillations or changes that correspond to body movements, including respiration-induced motion patterns.
In the Watch app on your iPhone, tap the My Watch tab, then tap Sleep. Then tap Track Sleep with Apple Watch to turn on this setting. To get the most accurate results when wearing your watch to sleep: Turn on Charging Reminders.
On your Apple Watch
Tap Wind Down or Sleep Goal under Options. Tap the Plus and Minus buttons to adjust your time. Tap the left arrow in the upper-left to go back and save your changes.
Go to the Sleep app on your Apple Watch. Turn the Digital Crown to scroll down to Full Schedule, then do one of the following: Change a sleep schedule: Tap the current schedule. Add a sleep schedule: Tap Add Schedule.
The Apple Watch's sleep stage algorithm was tested in a study of 166 people who wore both an Apple Watch and polysomnography equipment. Apple Watch was about 62% accurate in detecting deep sleep, confusing it for core sleep 38% of the time. This means your Apple Watch is likely to underestimate deep sleep.
If you've had enough REM sleep, you'll wake up feeling refreshed and alert. It is also associated with better mental health and a stronger immune system. As much as researchers know about this important sleep phase, REM is still not fully understood.
How much deep sleep is normal? The average Apple Watch user gets 49 mins of deep sleep per night —about 13% of total sleep time. (If you did the math and calculated the average person gets about 6.5 hours of sleep, that's right—most people aren't getting enough sleep.) 13% is the average, but there's a lot of variance.
You can set how long it takes iPhone to automatically lock. Go to Settings > Display & Brightness > Auto-Lock, then choose a length of time.
Open the Health app, tap Browse at bottom of the screen, then tap Sleep. If you have Sleep saved to your Favorites list, you can access it from the Summary page in the Health app. Tap Edit under the sleep schedule in Next. Drag the curved slider to set Bedtime and Wake Up times.
Tap My Watch, tap a watch below Family Watches, then tap Done. Tap Screen Time, tap Screen Time Settings, then tap Continue. On the following screens, configure options for allowable content, communication safety, time away from screens, and app and website limits. Create a Screen Time passcode.
REM sleep is characterized by relaxed muscles, quick eye movement, irregular breathing, elevated heart rate, and increased brain activity. Most adults need about two hours of REM sleep each night. REM sleep plays a role in memory consolidation, emotional processing, brain development, and dreaming.
Ideally, you need four to six cycles of sleep every 24 hours to feel fresh and rested. Each cycle contains four individual stages: three that form non-rapid eye movement (NREM) sleep and one rapid eye movement (REM) sleep.
Most people awaken after a normal night's sleep in the morning at some point in a REM episode, often in the midst of a dream. This suggests that there is a threshold for awakening and consciousness and that it is REM that drives the sleeping brain to reach that threshold.
Like many sleep trackers, the Apple Watch monitors sleep using a heart rate sensor and an accelerometer, which is a device that detects motion. The watch uses an algorithm developed through machine learning to analyze the information according to parameters from clinical sleep studies. It then displays the results.
You should aim for about 13 to 23 percent of your sleep to be in these stages. So, if you get 8 hours of sleep, you should be getting anywhere between an hour and just under two hours of deep sleep. However, it's important to note that what time you go to bed can greatly influence how much deep sleep you get.
You can wear Apple Watch to bed and track breathing disturbances while you're sleeping (on supported models), which can be used in an algorithm to detect signs of moderate to severe sleep apnea. Each day you're given an elevated or not elevated assessment for your breathing disturbances for the night before.
With the normal adult averaging a total of 3-5 cycles per night, 20-25% of sleep should account for REM for every 7-8 hours spent in bed. This can be variable depending on age, lifestyle, and other factors, especially as REM intervals decline as we get older.