Ashwin Lewis
The Samsung Galaxy Watch series offers sleep tracking features that monitor your sleep patterns, track your sleep movements, and provide a sleep score. The sleep score is a simple way to understand how well you slept. The higher the score, the better your sleep is deemed to be. The sleep score is based on a variety of factors, including sleep time, sleep stages, blood oxygen levels, and more. The watch can also monitor sleep apnea, snoring, and skin temperature. In addition to sleep tracking, Samsung also offers energy scores, which take into account sleep data and other metrics to represent one's overall energy levels.
| Characteristics | Values |
|---|---|
| Sleep score | Indicates how well you slept; the higher the score, the better |
| Sleep time | Shows your sleep time in hours and minutes, as well as your calories burned |
| Sleep stage | Shows how long you spent in various sleep stages, including Awake, REM, Light, and Deep sleep cycles |
| Blood oxygen during sleep | Shows your blood oxygen percentage |
| Snore detection | Records the amount of time you spent snoring |
| Sleep consistency | Shows the number of days in the current week that you've slept within your set sleep goals |
| Sleep apnea monitoring | Requires users to be at least 22 years old and monitor at least two sleep spells within 10 days |
| Energy score | A metric that utilizes multiple key metrics to generate a score representative of one's overall energy levels |
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Sleep stages
The Samsung Galaxy Watch's sleep tracking feature provides a sleep score that reflects the duration of sleep. This score is accompanied by a word-based descriptor and sleep symbols, offering users a more intuitive understanding of their sleep patterns. The watch also provides a breakdown of the various sleep stages, including Awake, REM, Light, and Deep sleep cycles.
NREM sleep is further divided into three stages, numbered N1, N2, and N3, with N3 being the deepest and most restorative sleep stage. N1 is the lightest stage of sleep, occurring when a person first falls asleep. During this stage, the body and brain activities start to slow down, but the body hasn't fully relaxed yet. N2 is when the body temperature drops, muscles relax, and heart and breathing rates slow. N3 is the deepest and most restorative sleep stage, allowing the body to recover and repair itself.
REM sleep is characterised by rapid eye movements and increased brain activity. It is during this stage that most dreaming occurs, and the body becomes temporarily paralysed. REM sleep is crucial for mental recovery and consolidation of memories.
The duration spent in each sleep stage can vary based on age, with newborns and young children spending more time in REM sleep and requiring more stage N3 sleep for growth and development. As individuals age, the distribution of sleep stages changes, reflecting a decline in the overall biological necessity for sleep. Additionally, factors such as depression, traumatic brain injuries, medications, and circadian rhythm disorders can also impact the time spent in each sleep stage.
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Sleep score calculation
The sleep score on a Samsung Galaxy Watch is a simple way to get a sense of how well you've slept. The higher the score, the better your sleep is deemed to be. The sleep score is calculated based on a variety of factors, including sleep time, sleep stages, and sleep consistency.
Sleep time: The Samsung Galaxy Watch records your sleep time in hours and minutes, as well as the calories burned during sleep. It also measures the duration of each sleep phase, including Awake, REM, Light, and Deep sleep cycles.
Sleep stages: The watch tracks your sleep stages and provides a breakdown of the time spent in each stage. This includes REM (rapid-eye movement), light sleep, and deep sleep. REM sleep is associated with mental recovery and a higher percentage of REM sleep contributes to a higher sleep score.
Sleep consistency: This metric shows the number of days in the current week that you have gone to sleep and woken up within your set sleep goals. It also includes bed/wake time consistency, which is a factor in the Energy Score introduced with the Galaxy Watch 7.
In addition to these factors, the Samsung Galaxy Watch also offers other sleep tracking features that may impact the sleep score calculation. These include:
- Snore detection: The watch can record the amount of time you spend snoring.
- Blood oxygen during sleep: The watch can measure your blood oxygen percentage during sleep, which is an indicator of overall wellness.
- Sleep movements and awakenings: The watch records the percentage of sleep that is interrupted, with an ideal range of 10% to 40%.
- Physical recovery: This factor is related to deep sleep, which is considered the physically restorative phase of sleep. It is presented as a percentage, with a figure of 40% or above considered excellent.
It's important to note that the sleep score calculation may vary slightly between different models of the Samsung Galaxy Watch. Additionally, Samsung Health provides daily goals and coaching programs based on sleep data to help users form better sleep habits.
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Sleep tracking
The Samsung Galaxy Watch uses the Samsung Health app and Sleep tile to monitor your sleep patterns, track any sleep movements, and see how they line up with your sleep score. The watch uses an onboard accelerometer motion sensor and its algorithms to detect when you've stopped moving and are asleep. It also uses additional sensors like heart rate and a SpO2 sensor to track biometric data.
The next morning, you can check your sleep score by swiping left on the watch home screen until you see the Sleep tile. Your sleep score is a simple way to get a sense of how well you've slept, with a higher score indicating a better night's sleep. Samsung breaks down your sleep into the following categories:
- Sleep time: Shows your sleep time in hours and minutes, as well as your calories burned.
- Sleep stage: Shows how long you spent in various sleep stages, including Awake, REM, Light, and Deep sleep cycles.
- Blood oxygen during sleep: Shows your blood oxygen percentage.
- Snore detection: Shows the amount of time you spent snoring.
- Sleep consistency: Shows the number of days in the current week that you've slept within your set sleep goals.
Samsung also introduced the Energy Score with the Galaxy Watch 7, which utilizes multiple metrics to generate a score representing one's overall energy levels. The Energy Score takes into account sleep time average, sleep time consistency, bed/wake time consistency, sleep timing, sleeping heart rate, and sleeping heart rate variability.
It's important to note that the sleep analysis does not consider any temporary or chronic health issues that may impact sleep, and there is currently no option to add notes to the data.
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Energy score
Samsung's Energy Score is a feature on its Galaxy Watch 7 and Galaxy Watch Ultra models. It is a numerical measurement out of 100 that reflects a health metric based on daily sleep and activity habits. The higher the score, the better, with a score of 85 or above indicating that you are in excellent condition.
The Energy Score is powered by Galaxy AI, which evaluates and increases your awareness of how your health influences your daily life. It provides personal recommendations to assist in making healthy lifestyle choices. For example, if your Energy Score shows you didn't rest well, Samsung might suggest you skip the gym and relax at home. On the other hand, if you're well-rested, your wearable could advise you to stick to your routine, encouraging you that this will positively impact your physical and mental health.
To ensure the accuracy of the Energy Score, Samsung Research collaborated with Professor Patrick O'Connor from the University of Georgia, USA. They explored the factors that can change the Energy Score and how it correlates to your "overall capacity," which includes both physical and cognitive factors. According to Professor O'Connor's findings, energy reflects the amount of activity one can sustain relative to one's total capacity.
The Energy Score feature is available on Samsung's Health app and compatible Galaxy watches and rings. It is also compatible with older Samsung wearables, such as the Galaxy Watch 4 Classic, and some users have reported success in pairing it with non-Samsung phones.
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Sleep analysis
The Samsung Galaxy Watch series offers sleep tracking to help users understand their sleep patterns and improve their sleep habits. The watch uses the Samsung Health app and Sleep tile to monitor sleep patterns and track sleep movements. The watch's onboard accelerometer motion sensor and its algorithms detect when the user is asleep, and additional sensors, such as heart rate and a SpO2 sensor, track biometric data.
The sleep tracking feature provides a sleep score, which is a simple way to understand how well the user has slept. The higher the score, the better the quality of sleep. The sleep score is based on the duration of each sleep phase, the user's movements while asleep, and additional metrics such as sleep time average, sleep time consistency, and bed/wake time consistency. The watch also monitors the number of sleep cycles, which typically last around 90 minutes and include non-REM and REM sleep. According to Samsung, adults should have between 3 to 7 cycles per night for optimal sleep.
The Samsung Health app provides a breakdown of the different sleep stages, including Awake, REM, Light, and Deep sleep cycles, along with an explanation of each stage. It also tracks metrics such as blood oxygen levels during sleep, snore detection, and sleep consistency. The app offers sleep coaching options and daily goals to help users improve their sleep habits. Additionally, the Galaxy Watch 7 and Galaxy Watch Ultra introduced the Energy Score, which uses sleep data and other key metrics to generate a score representing the user's overall energy levels.
While the sleep tracking feature on the Samsung Galaxy Watch provides insights into sleep patterns, it is important to note that it does not consider temporary or chronic health issues that may impact sleep. Users have also pointed out that the ideal sleep timing suggested by the watch may not align with their personal sleep routines or work schedules. Despite these limitations, Samsung's sleep tracking technology offers a fun and informative way to understand and improve sleep quality.
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Frequently asked questions
A sleep score is a simple way to get a sense of how well you’ve slept. The higher the score, the better your night of sleep is deemed to be.
Swipe left on the watch home screen until you see the Sleep tile, then tap it. You can also tap 'Show on phone' to open the information in the Samsung Health app on your connected phone.
Your sleep score is influenced by the duration of each sleep phase and your movements while asleep. This includes the amount of time spent in the four sleep stages of non-REM and REM sleep, as well as the number of interruptions and awakenings during your sleep.
