*These features are currently in beta testing. Click here to learn how to download the beta.*
Available on PACE 3, APEX 2/2 Pro, VERTIX 2, VERTIX 2S
In-app support available for all watch models
Your COROS watch can automatically recognize and track sleep 24 hours a day. Sleep lasting more than 3 hours will receive an overall sleep quality assessment and have sleep stages recorded, so you can understand the specific duration of each sleep stage: deep sleep, light sleep, and rapid eye movement (REM) sleep. Any sleep that lasts less than 3 hours will be categorized as a nap.
How is Sleep Quality determined?
Sleep quality is your overall "sleep score," and is evaluated based on overall duration of sleep and sleep stage recordings. Evaluation results are only available when there is continuous sleep of more than 3 hours for the day. There are five possible sleep quality evaluations: Great, Good, Fair, Low, and Poor.
- Sleep duration: This is the total amount of sleep throughout the day, including nighttime sleep and daytime naps.
- Sleep stages: Each stage of sleep is graded (light sleep, deep sleep, and REM), and the overall sleep quality score is calculated based on the score of the individual components according to a formula.
The US Sleep Research Association recommends a daily sleep duration of 7-9 hours for adults. However, due to individual differences, some people can feel refreshed after sleeping for 6 hours, while others may feel tired after sleeping for 10 hours. Therefore, it is important to focus on waking up feeling refreshed, as that is indicative of good sleep, rather than simply the duration of sleep. Sleeping less than 6 hours is considered insufficient sleep for most people, and may not be enough to support daytime activities. Sleeping longer than 10 hours is usually considered excessive sleep, often accompanied by an unreasonable distribution of sleep stages or other physical problems. If excessive sleep occurs for a long time, it is recommended to consult a medical professional.
When you fall asleep at night, you usually experience 4-6 sleep cycles, each lasting an average of 60-90 minutes. In each cycle, the sleep stage (light sleep, deep sleep, rapid eye movement sleep) and the awake stage alternate. Sleeping for ≥ 3 hours can have the sleep stages recorded, while sleeping for 15 minutes to 3 hours is recorded as a nap and does not have sleep stages measured. Learn more about the different stages of sleep here.
The total time listed is your total sleep time plus total awake time. The lower the proportion of awake time in total time, the higher the sleep efficiency was.
Nap refers to sleep recorded lasting 15 minutes to 3 hours. Naps will not show the sleep stage breakdown due to their short duration. The recommended daily nap duration is less than 30 minutes. Napping too long or later than 3:00pm may affect nighttime sleep and overall physical and mental recovery.
FAQs
Each sleep stage is weighted equally for the overall score calculation, unless one stage scores outside the optimal ("normal") range. The poor scoring stage is then weighted more heavily, and brings the overall sleep quality score down further.
This ensures you won't receive a "great" overall quality score if one sleep stage category scores very poorly, even if all the others score normally. Great overall sleep requires good balance for all stages.
If your watch tracked sleep duration that is 3 hours or less, this is considered a Nap, and will not receive an overall sleep quality score or sleep stages.
Naps contribute to that day's total sleep time, which impacts your Sleep Quality score (if you also have a longer (3+ hours) sleep period recorded for that same day).