How does Samsung Health know when I sleep?

In this guide, we will discuss “How does Samsung Health know when I sleep” and some additional things worth knowing about Samsung health such as how does Samsung Health measure my sleeping habits if I only have a smartphone and what happens if you have a smartwatch.

How does Samsung Health know when I sleep?

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If you wonder, ‘How does Samsung Health know when I sleep?’ then it is important to know that your phone may have an accelerometer sensor built-in which is very sensitive and if it is placed in your bed to record your movements throughout the night.

During the deep sleep phase, it uses a method called sleep actigraphy which has been reported in various scientific papers, which shows that it is not as accurate as PSG but provides an approximate amount of time. Some phones have an accelerometer sensor which is very sensitive and when it is placed in your bed, it records your movement when you sleep. 

Moreover, in deep sleep, your muscular activity or movements are suppressed to avoid acting out your dreams, and in this phase, the sleep graph gets nearly flat.

Sometimes we wonder if we are getting enough sleep or why we get up feeling tired after sleeping. It is important to know that the quality and length of your sleep will influence how you feel throughout your day. If you sleep just a few hours then, the probability of feeling tired and cranky while having a good night’s sleep contributes to your mood and will allow you to be productive.

Record your sleep

The Samsung Health sleep tracker is mostly done automatically since it will just kick in by itself once you have put your device down as you go to sleep. Therefore, there is no need to keep it in bed with you, instead, just put it wherever you normally put it. As we have mentioned, the app will start recording 30 minutes after you have gone to sleep.

As indicated by Amboy Manlo from, “if you wake up in the middle of the night to check briefly your device, Samsung Health won’t register the time you rose if you only use your handset for less than five minutes and go back to sleep. Once you wake up for good come morning, the app will register your wake time from the moment you pick up your phone to access it”.

Using your phone as soon as you wake up

For most of us, waking up and instantly grabbing our phone to check the Facebook feed or emails we have received during the night will allow the Samsung Health app to accurately record your wake time. However, if you belong to the group of people that has breakfast, takes a shower and gets ready before even grabbing the phone for the first time then, most likely, you’ll have to edit the time you woke up for a more accurate recording.

Finally, to check your sleeping habits, tap on the checkmark button on the upper-right within the sleep tile inside your Samsung Health app. This will give you the recorded time and length of your sleep.

Option to edit your sleep time target

If you configure your profile information such as your age and gender, your Samsung Health will automatically preconfigure your sleep time target, so pretty much, you don’t have to do anything else. However, the targets may not be as accurate to reflect your daily routine. For instance, if you usually work the night shift then, having a sleeping target from 11 pm to 6 am may not be realistic.

If this is the case then you will need to adjust your sleep target yourself within the app. Again, just tap on the sleep tile and you will find a three-dot menu in the top-right corner where you will see the option ‘Set target’. From here, simply swipe on the time bars for the options ‘Bedtime’ and ‘Wake-up time’ to set your sleep target manually. 

What if I have a Smartwatch?

As indicated by Samsung, “Samsung Health records and manages your 24-hour activity and sleeping patterns to cultivate a healthy habit. When connecting your Galaxy Watch Active to your mobile devices, you can save and manage the health-related data on the Samsung Health app. When you exercise for more than 10 minutes while wearing the Galaxy Watch Active, it will display an encouraging message”.

Consequently, after one hour of inactivity, your Galaxy Watch will notify you and show you some stretching motions to follow. If you are asleep, Samsung Health will analyse your sleeping pattern and record it by measuring your heart rate.

A graph will appear with your sleeping patterns and the average sleeping patterns of people in the same age group as you. However, if your heart rate shows irregular patterns then, your Watch won’t be able to recognise your heart rate properly. Additionally, remember to activate the ‘Record REM’ sleep switch to activate it by going into Settings in your device.

Monitoring your sleep habits

If you have a wearable device such as the Samsung Gear S then, it is important to understand that this type of device has a gyroscope which can detect any movement, even when you are sleeping. Needless to say, before you go to sleep, wear your Samsung watch and connect it to your smartphone. Tap on the Samsung Health app and click ‘sleep’. 

Subsequently, you will be asked to read some information related to measuring your sleep when you use it for the first time. To use it, just tap OK and then tap where it says ‘Record sleep, after you wake up, tap “I’m awake” so it will stop recording your sleeping pattern. 

Why is this blog about How does Samsung Health know when I sleep important?

As we have discussed, the Samsung Health app can determine if you are sleeping if your phone/smartwatch may have an accelerometer sensor built-in, which is very sensitive and if it is placed in your bed to record your movements throughout the night. However, remember that for some phones to track your sleep it is not necessary to leave the phone in bed at all. You can simply leave it where you usually do before going to sleep.

Finally, after you have set your Samsung Health app to track your sleep or to know when you are sleeping, it is pretty much done automatically so you don’t have to do anything else. As we have mentioned, the app will usually start recording 30 minutes after you have gone to sleep (inactivity).

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Frequently Asked Questions (FAQs) about How does Samsung Health know when I sleep

How does Samsung health track sleep?

Samsung Health tracks your sleep, largely in an automated manner since it usually kicks in by itself once you put your device down as you go to sleep. However, you may not need to keep it in bed with you, just put it wherever you normally do as you turn in for the night.

How does your phone know when you are sleeping?

Some phones are able to detect your movement while you sleep in order to determine when you are sleeping. There are some apps such as Sleep Cycle (compatible for iOS and Android) which use the movement when you sleep to determine which phase of sleep you are in, and wake you when you are in light sleep, so you won’t wake up feeling tired.

How do I change the sleep time on my Samsung health?

To change the sleep time on your Samsung Health, open Samsung Gear on your smartphone, open Samsung Health and Select the ‘Sleep’ category. Next, select the dots on the top right corner beside the option that says ‘Share’ and select ‘Set Target’. Finally, use the sliders to change your bedtime and wake time.

Why is Samsung health not counting my steps?

If your Samsung Health is not counting your step try to check if perhaps there is a pending update in your Google Play Store or Galaxy app. Additionally, try to clear the cache of the Samsung Health app through settings>Apps>Samsung Health>Storage>Clear cache. If the issue still persists, choose the option ‘Clear data’. 

Is Samsung health good?

The Samsung Health app is regarded as ‘good’ by many users since it allows you to track your fitness and other aspects of your health life. Even if you are not a Samsung user, it is worth trying it at least for once. It has many functionalities and it is user friendly.


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