Emfit Corp. (USA)

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Get ready for some serious insights

Our sleep tracker offers a lot of features for you to balance the strain and rest of your daily life and training. Our sleep data includes sleep score, sleep time and all three sleep classes (light, deep and REM). Our recovery data includes HRV RMSSD throughout the whole night*, total recovery*, integrated recovery* and ANS (autonomic nervous system) balance*. Then there is of course heart rate and breathing rate, and finally, movement activity* through the night. Find out more about each of these features below and learn why measuring them is important.


Sleep Score

Sleep is paramount to peak performance. The Sleep Score is a single number from 0 to 100 indicating the quality of sleep. The number is strongly based on your total sleep time, but the amounts of REM and DEEP sleep and the number of estimated awakenings are also included in the math. The more you sleep, the more REM and DEEP sleep you get, and the better your Sleep Score is. Usually values around 80 and higher can be regarded as good. This feedback on the quality and quantity of your sleep helps you understand how much sleep and rest you actually need.


Disclaimer: The estimation of awakenings is based on movement activity. If you quietly watch TV or read in bed without moving much, it is easily interpreted as sleep. In addition, if you are awake for long periods of time at night but not tossing and turning – just trying to fall a sleep – this is calculated as being asleep. Therefore, this product is not suitable for estimation of actual sleep/awake time and sleep quality in all use cases. 

However, you can very easily alter your sleep period in the morning by adjusting the time you actually started to sleep and woke up! That way you can easily eliminate the times when you were watching a movie in bed in the evening or scrolled through your phone before getting out of bed in the morning, for example.

Sleep Quality

You need to get enough sleep, but your sleep should also be structured properly. In other words, your sleep should contain enough REM sleep for the recovery of your mind and DEEP sleep for the recovery of your body. EMFIT records the total amount and structure of your sleep and the percentages of REM and DEEP sleep. That way you can easily learn how much sleep you need to allow both your mind and body to recover properly. In addition, this data can help you adopt positive sleep habits and notice habits that negatively impact your sleep quality — and learn which habits are best for your health and performance. 

Deep sleep is the time when your body recovers. It is when your cells repair themselves and your body gets ready for all the physical challenges of a new day – let’s say a basketball game, for instance. When you get enough deep sleep, your body feels physically ready for flying up and down the court and destroying the opposing team. 

REM sleep is when your mind recovers, making sure all the important things you learned, saw, and experienced during the day are stored in a safe place. So for example in that basketball game, you remember all the plays you rehearsed and your mind feels sharp. 

Light sleep is just a lighter stage of sleep that doesn’t do much for your recovery – it’s just there. It is the transition phase between the other, more important stages of sleep.


Heart Rate Variability (HRV RMSSD)

HRV – or the change in time intervals between your heart beats – is a broad indicator of your overall health and fitness. If your heart beats steadily with intervals of identical length between each pulse, you have low HRV. That is considered “bad.” If your heart beats are of varying length between each pulse, you have high HRV, and that is considered “good.” Years of clinical research have shown that the higher your HRV is, the greater your resilience and the lower your stress are – and vice versa. The lower the HRV, the lower your resilience and the greater your stress. We measure HRV throughout the entire night, and out of all our features, this is the one especially athletes appreciate the most.


Total Recovery

Total Recovery is simply the difference between your morning and evening HRV values. Usually it should be positive, indicating you have recovered efficiently and got enough rest during the night. Recovery values are highly individual. You should inspect them against your own baseline values and also in comparison to your Evening HRV values. The histogram values in the detailed nightly HRV view make it easier for you to see your baseline, and so do the long term trends.


Autonomic Nervous System (ANS) Balance

It is important for you to know the balance of your autonomic nervous system because it controls and regulates all the functions necessary to maintain life. This is known as the balance between sympathetic and parasympathetic nervous system, and the balance can be affected by stress, for example. 

The optimal range in this graph is in the green shaded area, but the lower the graph is, the better. It means your mind and body are less stressed. You might notice that on a night after a relaxing yoga or meditation session in the evening, for example, the graph decreases. Or maybe after you’ve had a few glasses of wine, it goes up. Seeing such correlations helps you to make decisions that have a positive impact on your recovery and wellbeing.


Heart & Breathing Rates (HR & RR)

EMFIT relies on ballistocardiography – a technique for sensing the sudden ejection of blood into the great vessels with each heart beat – and breathing movement analysis. It measures your heart and breathing rates and uses this data along with movement activity data to calculate the sleep classes. 

It also measures resting heart rate, which tells about your general health. For example, a couple of days before getting actual flue symptoms, your resting heart rate will usually rise, letting you know you might want to take it easy and allow your body to rest. In the long term, a decreasing resting heart rate can mean your fitness is improving and shows you’re on the right path! On the other hand, an increased resting heart rate on the long term can be used as a mild indicator of overtraining or stress, for example.


Movement Activity

EMFIT tracks how restless your sleep is based on the amount of movement during your sleep. One of our users, Sky Christopherson, World Record holder and founder of OAthlete, uses movement data as an indicator of how hard his athletes’ workouts are. The more restless the sleep, the harder the previous workout has been for the athlete’s body and the lighter the next workout should be.


All of this without having to wear a device