Tempurpedic sleep tracker7/22/2023 ![]() (This also is a plus in that it doesn’t require charging it’s simply plugged in all the time.) The Google Nest Hub is unlike many other sleep trackers in that it doesn’t come into physical contact with you or your mattress. They all left something to be desired, but that wasn’t true of the Google Nest Hub, a smart display with sleep tracking. I’ve tried most types of sleep trackers, aside from a full-on smart mattress. The Nest Hub is the only sleep tracking device that's detected exactly when I go to bed and fall asleep. I may think I slept great, but according to Fitbit, my rest wasn’t, er, restful at all. What’s more, sometimes the overall sleep scores don’t line up with my subjective experience. I’ve used the Fitbit Sense, and own a Versa, and they both consistently failed to decipher exactly when I’m asleep, as opposed to when I’m in bed, but on my phone and barely moving. Even so, the data they collect and transmit to your phone (usually accessible via the manufacturer's app) may not tell you everything. You’ll have to remember to recharge if you never want to go a night without sleep data. For instance, if the app shows your levels are a little low, you can mention it to your primary care provider or another medical professional to see if it’s of concern.ĭespite all the technology, these devices aren’t perfectly accurate and have a limited battery life. Wearables with this feature may send the data to your phone, which you can review for yourself for any noticeable patterns. When present overnight, it’s a hallmark of sleep apnea. Though none of the sleep trackers we’ve tested or discuss in this article are medical grade, pulse oximetry is a tool used by professionals to assess hypoxemia, or an abnormally low concentration of oxygen in the blood. Highly oxygenated blood absorbs more infrared light and allows a lesser proportion of red light to reflect back. The two types respond differently to blood that’s more or less oxygenated. the red light on the back of your device). This feature utilizes a combination of red and infrared sensors (a.k.a. As such, wearables with heart rate tools can provide a more accurate picture of not only the stages of sleep, but when you fall asleep to begin with.Ĭertain devices, including Garmin watches with advanced sleep monitoring as well as some Fitbits, may use pulse oximetry to track the oxygen saturation in your blood. In deep sleep, your heart rate will drop to 20% or 30% below your resting rate. It decreases early in the night as your body shuts down. ![]() Of course, if you’ve ever used one of these devices, you may know these LEDs work constantly-including overnight when there are significant changes to your pulse. Pulses reflect less green light, whereas a greater amount reflects in between each beat, allowing the diode to determine how often your heart beats. With every heart beat, blood surges through your veins. On Fitbits, for example, these tiny LEDs monitor heart rates by “flash hundreds of times per second.” After each flash, the device uses a diode to translate brightness into data. "When you haven’t moved for about an hour, tracker or watch assumes that you’re asleep."īut the ever-present question is how? If you own a wearable, you’ve probably noticed the little lights on the back of the device. Additional data-such as the length of time your movements are indicative of sleep behavior rolling over… help confirm that you’re asleep.” When you haven’t moved for about an hour, tracker or watch assumes that you’re asleep. According to Fitbit, its devices with heart rate monitors rely upon “a combination of your movement and heart-rate patterns. Wearables with heart rate detection can provide a more nuanced snapshot of your sleep, including the different stages of your sleep cycle. Even the most scaled-back Fitbits, like the Fitbit Flex-an early model that was recently discontinued-rely upon three axis accelerometers to follow movement as you sleep. Apple Watch also relies on at least one accelerometer, though I couldn’t find specifics on the configuration of axes. One is parallel to the device’s screen and runs left to right, another parallel plane runs from the top to bottom, and the third is perpendicular to the device’s screen and points upward. For instance, Fitbit and Garmin, and Whoop use “three axis accelerometers” to measure movement along three planes. ![]() ![]() Movement tracking is fairly self-explanatory: Trackers use accelerometers, which measure acceleration. Most rely heavily on heart rate and movement to estimate sleep stage and overall quality. Wearable devices with sleep tracking run the gamut from the classic Apple Watch and Fitbit offerings to off-the-beaten-path products such as the Oura Ring. Most wearables use a combination of movement and heart rate to assess your sleep. ![]()
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