In this article, you’ll find an explanation of what Sleep Regularity, Sleep Duration, Awakenings, and Sleep Stages are, as well as a guide to reading each chart. You will also learn all about the Sleep Summary screen and how to interpret your data.
- Good-to-knows
- Sleep Regularity
- Sleep Duration
- Sleep Stages
- Sleep Summary screen
- Sleep Heart Rate Variability (HRV)
Good-to-knows
- All sleep-related metrics are available in the Overview and Sleep Summary screens.
Sleep is usually detected and logged automatically when you wear your watch overnight.
- If sleep isn’t detected, you can log sleep manually.
- You can edit your sleep duration and awakenings at any time from the Timeline tab, if adjustments are needed.
Sleep Regularity
Sleep Regularity shows how consistently you maintain your bedtime (moon icon) and wake-up time (sun icon). Some variation is normal, but keeping a steady schedule supports your natural rhythm and overall well-being.
Awakenings
Awakenings are the number of times you wake up during the night. Brief awakenings are part of a normal night of sleep, but frequent wake-ups can influence how rested you feel.
Monitoring these patterns can help you understand your sleep quality over time.
How to read the Sleep Regularity chart
Daily Sleep Regularity (green bars)
Each bar represents your Sleep Regularity each night.
Dark green: Time in bed but not asleep.
Light green: Time asleep.
White: Awakenings that are longer than 5 minutes.
Typical Bedtime (line besides the moon icon)
This is your baseline time when you go to bed.
Typical Wake-up Time (line besides the sun icon)
This is your baseline time when you wake up.
Regularity zone (area between the moon and the sun)
The area between the moon and the sun icon lines represents your Regularity Zone.
- Regular sleep (green bars fall within the lines): You are consistently sticking to your bedtime and wake-up time. This helps improve your sleep quality.
- Irregular sleep (green bars fall outside the lines): You are not consistent with your bedtime and wake-up time.
Sleep Duration
Sleep Duration shows the total amount of time you slept. While sleep needs vary, most adults benefit from 7–9 hours of sleep each night.
How to read the Sleep Duration chart
Daily Sleep Duration (grey bars)
The bars represent your Daily Sleep Duration each night.
Typical Sleep Duration (line)
It reflects your usual sleep pattern over time and shows how your sleep time changes over a longer period. Keeping a regular sleep duration supports your natural rhythms and general health.
Consistently sleeping too little or too much can impact your health.
Recommended Sleep Range (highlighted area)
Shows the recommended sleep range for your age, based on the National Sleep Foundation:
18–25 years: 6–11 hours
26–64 years: 6–10 hours
65+ years: 5–9 hours
Sleep Stages
Your sleep is made up of four stages: Light, REM, Deep, and Awake — each playing a different role in how rested you feel.
- Light sleep helps your body start to relax and makes up the largest portion of your night.
- REM sleep is where most dreaming happens and supports memory, mood, and brain function.
- Deep sleep is the most restorative stage, important for muscle repair and overall recovery.
- Awake time includes brief moments of wakefulness during the night, which are totally normal.
The percentages and time durations show how much of your total sleep was spent in each stage.
Sleep Summary screen
The Sleep Summary gives you an overview of your night, including your sleep stages, awakenings, sleep duration, and heart rate variability. This screen is currently available on iOS only.
You can tap any date at the top to switch nights and view insights for a different day.
How to access it
Open the Overview tab.
Tap the Asleep or moon icon at the top.
Under Sleep Regularity or Sleep Duration, tap any bar.
Tap the arrow next to Awakenings (if you're under Sleep Regularity) or the date (if you're under Sleep Duration) to view that night’s Sleep Summary.
Insights available
In the Sleep Summary, you will find:
Your self-reported sleep quality: Your answer to how you slept.
Awakening stage: The sleep stage you were in when you woke up.
Average Heart Rate Variability (HRV): The variation in time between heartbeats during sleep.
Sleep Duration: Total time spent asleep.
Times Awake: The times you wake up during the night.
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Time in bed and Asleep:
Light green: Time asleep
Dark green: Time in bed but not asleep
Black (light mode) or white (dark mode): Time awake
Sleep stages: Awake, REM, Light, Deep, and Undefined, shown as both percentages and total time.
Sleep Heart Rate Variability (HRV)
Heart Rate Variability measures the variation in time between each heartbeat. It is recorded during sleep and reflects how well your body recovers overnight.
How to read the Sleep HRV chart
Sleep HRV (blue dots)
The blue dots represent your Sleep HRV each night. The chart helps you understand how well your body restores itself.
- Higher Sleep HRV: Your body recovered well overnight and is prepared for the day.
- Lower Sleep HRV: Your body may be recovering less effectively.
Temporary dips are common. However, consistently low values may indicate that your body needs more rest or support. You may want to focus on sleep quality, stress management, or adjusting physical activity.
Typical HRV Range (highlighted area)
Your Typical HRV Range reflects what is normal for you when your body is functioning well. Comparing your sleep HRV to this range helps you understand your recovery needs.
HRV is highly individual. A “low” HRV for one person may be normal for another. What matters most is your own trend over time.
Wear requirements
You need at least 10 days of wear in the last month to see your Typical HRV Range.
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