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How Do Sleep Trackers Work And Are They Accurate?

With growing technology, many sleep tracking applications have emerged. As human life keeps on getting busier, having proper sleep has become a necessity. And for the same many sleep tracking applications have been developed. The following guide explains how these sleep trackers work. Also, we have in detail described the accuracy and reliability of these apps. So without any further ado, let’s begin.

What All Do Sleep Trackers Keep Track of?

There is a vast selection of sleep tracker apps available on the market today. A lot of them are wearable trackers that you may fasten around your wrist. Others will clip onto your pillow or sit on the table next to your bed.

These devices have a variety of features, but the following are some of the most prevalent ones:

  • The gadgets can monitor the length of your sleep by measuring the amount of time that you are inactive. This allows them to determine when you go to sleep at night along with the wake up time.
  • The quality of your sleep may be determined by a tracker’s ability to identify periods of awake time throughout the night, such as when you toss and turn or get up to use the restroom.
  • Phases of sleep: Some monitoring systems monitor the stages in which you sleep and adjust the time at which your alarm goes off so that it goes off for a phase in which you are sleeping more lightly. In theory, it should make it a little bit simpler for you to get up and move.
  • A number of the gadgets on the market are able to record environmental aspects, such as light, temperature, etc present in your bedroom.
  • Lifestyle variables: Some trackers may urge you to input information on activities that might impact sleep, such as how much coffee you’ve had, when you’ve had your meal, or whether or have high stress levels. Other trackers will simply provide you with a list of lifestyle factors.

How do sleep monitors really function?

There are a few different mechanisms that sleep measurement equipment may use to monitor sleep; the precise process relies on the particular gadget that you are using. The following is a list of sleep parameters:

Environmental Factors

Some of the gadgets that monitor sleep employ microphones, sensors, and thermometers to detect light and noise levels, as well as room temperature and humidity, in order to determine the quality and length of the user’s sleep

Pace of Heart and Breath

It tracks the graph of heart rate and your breathing patterns. These constraints are intimately related with various phases of sleep; once a person enters intense stages of sleep, rates begin to drop.

Tracking devices may use this information to determine as you get into REM sleep, light sleep, deep sleep, as well as any disruptions that occur during night. Some gadgets use this information to determine when you are in the lightest sleep and set their alarms to go off at that moment to make it easier for you to wake up.

Certain devices use photoplethysmography, often known as PPG technology, to detect a person’s heart rate by emitting red and green light. The red light is reflected by the blood under the skin, whereas the green light is absorbed by the blood. During each pulse, the organism is able to absorb a greater quantity of green light than it can in the intervals in between heartbeats.

In addition, some of these wearable devices also use pulse oximetry. These are composed of multiple sensors including red & infrared, to properly monitor breathing rates. Non-wearable systems, on the other hand, make use of radio frequency technology. Snoring and sleep apnea are two sleep disorders that may create disruptions in a person’s breathing while they sleep. Respiratory patterns are very significant in diagnosing these types of problems.

Temperature of the body

The temperature in the center of your body also shifts when you are sleeping; for example, non-REM sleep is accompanied by a cooling of the core as well as the brain. As a result, some wearable gadgets measure the temperature of the skin in the same manner as a thermometer does in order to identify the beginning of sleep as well as transitions into various stages of sleep.


Small motion detectors, also known as accelerometers, monitor the amount of movement you make during the course of the night to determine the quality and quantity of your sleep. When the tracker observes that you have remained still for a certain amount of time or that you have only moved in ways that are consistent with sleep (such as turning over), it will conclude that you are now sleeping.

Elements Related to Lifestyle

There are some sleep trackers that ask you to fill out information about your routines and activities during the day in order to determine how such things could impact the quality of your sleep. For instance, the amount of stress you’re under, the time and quantity of coffee or alcohol you’ve eaten, the amount of physical activity you did, and the time of your most recent meal are all factors that might influence how much or how little sleep you get at night.

The majority of trackers now available on the market will compile all of this info into a report that analyzes your sleep and gives insights into its quality. This gives you the ability to monitor changes over time, establish objectives, and get advice on any adjustments you may make to improve the quality of your sleep experience.


Hopefully, now you are aware of working of sleep trackers. Moreover, the above guide must have also helped in explaining the credibility of these apps. If you have any more questions regarding the same feel free to connect us in the comments. For more informative tech guides make sure to subscribe to our blog.


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