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Hãy viết đoạn tóm tắt về nội dung bằng tiếng việt kích thích người mua: What Your Sleep Tracker Can Reveal About Your Health

These days, you don’t have to go into a sleep clinic to learn key details about your sleep. If you have a smartwatch, fitness tracker or even a health app on your phone, you can gather useful sleep data from the comfort of your own bed, ranging from heart rate to breathing rate and  percentages.

This story is part of Health by the Numbers, CNET’s deep dive into how we quantify health.

When you first look at your sleep tracker data, all those numbers and graphs may feel dizzying. But tracking your sleep can reveal a wealth of information about your health that you may have been totally oblivious to before. If you utilize that data, you can manipulate your diet, workout routine, tactics and other factors to become superhuman. OK, maybe not superhuman (unless you’re an expert biohacker), but you’ll still feel dang good. 

The information available to you depends on the device you have, but most sleep trackers collect a variety of data points. In this article, we explain what your sleep data points mean and how to use them to your benefit. 

Read more: Best Fitness Trackers

What are the three sleep stages?

Most sleep trackers break your night down into three main categories of sleep: REM, deep and light, although you actually cycle through five stages of sleep each night. Knowing how much time you spend in each sleep stage can help you understand your energy levels and fluctuations during the day. 

Light sleep

In order to transition to a deep state of sleep you must pass through light stages of sleep, says Dr. Alison Brager, sleep researcher and performance engineer for Momentous, a sleep supplement company. “Light stages of sleep aren’t necessarily restorative relative to deep sleep, but rather part of the process of getting to the deepest stages,” Dr. Brager says.

How much light sleep you should get: This may come as a surprise, but light sleep constitutes the majority of the sleep cycle. Between the two distinct phases of light sleep (sleep stages one and two), you may spend up to 60% of your night in light sleep.

Use These 27 Tips to Help You Sleep Better Starting Tonight

Deep sleep

During deep sleep, your breathing rate and heart rate slow down even more and your body wholly relaxes. This is when it’s hardest to wake from your slumber — it’s also when tissue repair, cellular regeneration and other important processes happen. “Deep sleep is where all the magic happens,” Dr. Brager says. 

How much deep sleep you should get: Ideally, your sleep tracker will reveal you spent at least a couple of your sleeping hours in deep sleep. Research suggests that healthy adults spend up to 23% of their slumber in deep stages. Anything less than 10% may lead to symptoms of inadequate sleep, even if you spent eight hours in bed.

REM sleep

REM sleep makes up the final stages in your sleep cycle, and it impacts you emotionally and cognitively, says Ariel Garten, co-founder of Muse, a sleep and neuroscience technology company. 

“REM sleep helps us calibrate our sensitive emotional circuits,” she says. It also “helps us make sense of information we learned while waking, as circuits are fired alongside new information, allowing it to be re-organized, consolidated or jettisoned from our brain.”

How much REM sleep you should get: In healthy adults, REM sleep makes up about 20 to 25 percent of a night’s sleep, according to the Institute of Medicine Committee on Sleep Medicine and Research. Less than this may indicate you aren’t processing and storing information to your full potential.

Heart rate

Sleep is a restorative process, so it only makes sense that your heart rate declines during sleep, Dr. Brager says. Everyone’s daytime resting heart rate is different, so everyone’s sleeping heart rate will differ, too. 

Generally, sleeping heart rates should hover around the low end of normal, even for people who aren’t physically fit. A normal ranges from 60 to 100 beats per minute, according to Harvard Health, although very active people may have resting heart rates from 40 to 50 beats per minute.

During sleep, expect your to the low end of your normal: If your normal daytime resting heart rate ranges from 70 to 85, for example, expect to see a sleeping heart rate of 70 to 75 beats per minute, or even slower.

If your heart rate doesn’t decline during sleep — or worse, it speeds up to higher than your daytime resting heart rate — consider talking to a sleep doctor. High heart rates during sleep may indicate medical or psychological conditions, including anxiety or atrial fibrillation. 

There is one caveat: It’s normal for heart rate to increase during REM sleep. During REM sleep, your brain becomes highly active and your heart may follow suit, but your heart rate still shouldn’t soar past your normal daytime heart rate.

Breathing rate 

Your (HRV) simply refers to the variation in the amount of time between heart beats. 

If you’re in fight-or-flight mode and your heart is racing, there is little time between heart beats (low HRV). On the other hand, when you’re relaxed, your heart beats slower and there’s more time between heart beats (high HRV).

The higher your HRV, the better, especially during sleep. If you have a high HRV, it means your body is adaptable and at the ready. Your HRV is a direct indication of how much stress your body is under at a given time — which is why you want to see a high HRV during sleep. 

If your sleep tracker data shows low HRV, your body is in overdrive during sleep for some reason. Studies show that low sleep HRVs may indicate sleep disorders, so if yours is consistently low, consider the factors that may affect it: stress levels, bedtime routine, sleep environment. If you suspect a medication or medical condition is the culprit, talk to your doctor.

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