The takeaway here is that measuring heart rate is a more accurate way of tracking sleep since the body's heart rate will change when entering the different stages of rest. Most of the more pricey dedicated sleep trackers will have some form of heart rate sensor that sits on or near the body in order to measure heart rate. At the time of this writing there is only one device that has this capability - the S+ by Resmed. The upside to this method is that it is completely unobtrusive - you don't have to have a sensor touching your body. Radio waves can be used to measure your heart rate and sleep cycles, albeit a bit less accurately. Take a look at this article here to learn more about bio metric sensors and how they function. The accuracy of this sensor type is still up for debate, but it is easily the smallest and least intrusive of the heart rate monitors. In other words, the surface of your skin emits a tiny electric current and the sensor is able to read this current. This type of sensor operates by tracking the electrical signals generated across the the skin, which is otherwise known as galvanic skin response. Bio Impedance tracking is the latest in heart rate monitoring technology. Ballistic heart rate sensors are able to monitor this rhythm and give an accurate measurement of your heart rate. As the heart go's through its normal rhythms, it will force blood in and out of the vessels with each beat. They operate by simply monitoring the speed at which the heart contracts and expands.
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