In-app support available for all watch models. Sleep Score is available on PACE 3, PACE 4, PACE Pro, COROS NOMAD, APEX 2/2 Pro, APEX 4, VERTIX 2, VERTIX 2S.
Your COROS watch recognizes and tracks sleep automatically, 24 hours a day. Your first recorded sleep for the day that's longer than 3 hours will receive a full assessment: an overall Sleep Score, plus a breakdown of sleep stages. Any other sleep that day is logged as a nap. To learn more about how COROS watches track sleep, read our guide here.
How Your Sleep Score is Calculated
Your Sleep Score reflects six factors:
- Total sleep duration
- Naps also contribute to your sleep duration.
- Deep sleep percentage
- REM sleep percentage
- Wakefulness (how often and how long you wake up during the night)
- Bedtime consistency
- Sleep stress
A score from 0-59 is labeled Low, 60-79 is Productive, and 80-100 is Optimal. Below your score, you'll find a summary of your sleep quality. Scroll down and tap any of the six evaluation factors to read more about each.
Total Sleep
Adults generally require 7-9 hours of sleep per night, but sleep needs vary by individual. COROS reviews your sleep duration over the past two months and sets your target at the higher end of that range. You can still receive an Optimal score even if your sleep duration is 30 minutes less than your target sleep duration, but if your overall sleep duration is less than 6.5 hours, your score will decrease.
Deep Sleep Percentage
Deep Sleep, or slow-wave sleep, is when your body does its heaviest repair work: physical recovery, immune support, and memory consolidation. It typically makes up 16–30% of total sleep. A number above 40% may signal the body is under additional stress and can correspond to sleep deprivation, drowsiness, or lethargy.
REM Percentage
A critical stage of your nightly sleep, REM (rapid eye movement) is where dreaming, learning, and memory strengthening happens. REM usually accounts for 11-35% of your nightly sleep.
Wakefulness
"Awake" time includes times that you are consciously awake (and perhaps even getting up or walking around), and the brief wake-ups you may not even remember. COROS includes both of these in your total wake time, with less than 20 minutes of wakefulness considered optimal. Any periods of wakefulness lasting longer than 5 minutes are labeled as "Interruptions", with more than one of these negatively impacting your sleep quality.
Bedtime Consistency
A consistent sleep schedule keeps your body's repair and recovery systems working with your circadian rhythm. After 7 days of tracking, COROS establishes your baseline (your average bedtime over the past 30 days) and suggests a target bedtime to help you maintain regular habits.
Any deviation within 30 minutes of your baseline is considered optimal. If you fall asleep over 30 minutes before to your regular bedtime, your sleep score won't decrease as much compared to falling asleep much later than your normal bedtime - since going to bed later adds more strain on your circadian rhythm.
Sleep Stress
Any physical or mental pressure that you experience during sleep - usually from high-intensity exercise, large meals, alcohol, or caffeine before bed - is recorded as Sleep Stress. Higher stress levels correspond to elevated heart rate and lower overnight HRV, which negatively impact sleep quality.
How to Edit Sleep Logs
If a sleep session was recorded inaccurately, you can crop, extend, or merge it in the COROS app. Important: Any edits you make here may affect your total sleep duration, sleep stages, wakefulness, or bedtime consistency, which in turn impacts your Sleep Score.
- From the main sleep page, scroll to the night you want to adjust.
- Scroll down to the Sleep Stages section and press the edit icon on the right side of the screen.
- Crop sleep times: Tap the edit icon next to your main sleep, then press and hold either endpoint to adjust your sleep or wake time. Use the timestamp selector at the bottom for finer control.
- Extend sleep times: Follow the same steps as above, and use the timestamps at the bottom of the page to select an earlier sleep time / later wake time.
- Merge sleep logs: You can merge two separate sleeps (such as a main sleep and a nap) as long as the interval between them is 1 hour or less. From the sleep edit page, press the Merge button in the bottom left corner.
- Add a sleep log: From the sleep edit page, press the Add button at the bottom, and input your sleep time and wake time.
If you need to revert any changes, tap Restore in the top right corner of the edit page to bring back your original recorded data.
Sleep Trends and Historical Sleep Data
At the bottom of the sleep page, you can see how last night's sleep compares to the past 7 nights.
Toggle to the weekly, monthly, or annual view to see more insights into your sleep data. You can compare total sleep time, sleep stages, bedtime consistency, and sleep stress against different time frames. Swipe across each of these graphs to move through time, or press and hold on a data point for more detail.
Naps
Any sleep outside of your "main" sleep for the day is considered a Nap. Your COROS watch tracks naps automatically, or you can use the "Timed Nap" feature for greater accuracy if you are planning to take one and wish to have an alarm set. Learn more here: Nap Detection and Tracking
Why did my Sleep Score decrease after taking a nap? You may receive a higher sleep score initially upon waking up, and after taking a nap later that day, you may see your sleep score go down. This is because naps contribute to your total sleep duration, but not other areas of sleep quality such as deep sleep, REM, etc. So your total sleep time can push outside of the optimal range, thereby decreasing your sleep score.