Ultimately, this leads to the question of whether knowing about our sleep is actually beneficial to us. For example, one study of heart rate sleep trackers showed that two consumer devices tended to underestimate the amount of deep sleep wearers obtained by as much as 46 minutes. However, even in devices that do track heart rate, many experts are still uncertain of their accuracy because of the limited research on them, and because of the differences between each device. Watches that incorporate heart rate data tend to be slightly more accurate when measuring sleep duration because heart rate fluctuates during different sleep stages. But as sleep trackers only measure movement, one study found watches were unable to differentiate sleep from wakefulness in people with insomnia. People with insomnia tend to remain very still in bed in an attempt to fall asleep. Studies also show sleep devices underperform in people with insomnia. Furthermore, the algorithms which companies use to make predictions about sleep are unknown, making it difficult for scientists to identify whether the assumptions made by the sleep devices are valid. Given many consumer sleep devices haven’t been compared against polysomnography tests, it’s difficult to determine their accuracy rate. Many sleep devices also fail to differentiate one stage of sleep from another based on motion alone. As we move frequently during all stages of sleep, movement provides few clues about what sleep stage we’re in. Analysing brain wave patterns is the only definitive way of knowing whether someone is awake or asleep, and to know what stage of sleep they’re in.īut since sleep trackers are worn on the wrist, they make their estimates of nightly sleep by measuring body movement and sometimes heart rate data.
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Polysomnography tests are the most accurate because they track a person’s brain waves, heart rate, breathing, blood oxygen levels, and body and eye movements during sleep through electrodes attached to the skin and scalp. This accuracy drops to around 38% when estimating how long it took participants to fall asleep.
So far, research has found that compared to polysomnography tests – which experts use to diagnose sleep disorders – sleep trackers are only accurate 78% of the time when identifying sleep versus wakefulness. Some devices also look at heart rate changes during sleeping to estimate how much time you spent in each sleep cycle.ĭespite their popularity, only a few studies have investigated how accurate sleep devices are. Most sleep trackers are a watch worn on the wrist, and work by monitoring your body movements as you sleep to determine how much time you probably spent awake versus asleep. The “deep” portion of our sleep is mainly what leaves us feeling refreshed the next day. This blossoming interest has seen an explosion of sleep trackers which measure how many hours of sleep you get each night.Īs we sleep, we go through cycles of “deep”, “light” and “rapid eye movement” (REM) sleep. So it’s hardly surprising people are more concerned than ever about getting enough sleep. Water-resistant, with a harder front display made with premium Sapphire Crystal it’s 1.6 times stronger against scratches and ready to tackle just about anything your day dishes out.An estimated one in three people report regular sleep complaints. With a bigger battery than its predecessors and fast charging, you’re ready to go in no time. It takes about 30 minutes to go from 0% up to 45% charge. Bioelectrical Impedance Analysis sensor, Electrical Heart sensor (ECG), and Optical Heart Rate sensor. The powerful 3-in-1 Samsung BioActive sensor controls three health sensors effectively. Plan your bedtime, detect snoring, understand and track your sleep stages (awake, light, deep, REM) via 8 animal sleep symbols representing your sleep type. Know your sleep with our new and improved sleep tracking technology.
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