How Apple Watch suggested my poisonous highlight level, and helped me repair it


The Apple Watch’s built-in Breathe app is an glorious approach to start a imagining routine.

Jason Hiner/CNET

When we started regulating a SleepWatch app on a Apple Watch a year ago, we dictated to mostly review it to other nap tracking products we had tried. But it led to a array of events that helped me not usually quantify my nap softened than other nap tech, though also identified a bigger issue: my diseased turn of stress. Combined with a integrate other apps on a Apple Watch, we was means to urge my highlight and lane my swell by following Heart Rate Variability.

It all kicked off final May when we started contrast a SleepWatch app and a integrate other nap tracking apps on a Apple Watch. Part of my proclivity was that reports had begun present that Apple was operative on adding built-in nap tracking to a Apple Watch. So we wanted to see if a Apple Watch indeed had clever adequate battery life to hoop nap tracking, if we disposed wearing my watch while we slept, how accurate a tracking could be, and what kinds of information it could provide.

After contrast a giveaway versions of several nap tracking apps. we gravitated to SleepWatch given it felt like a many polished, many notation and a one that was many like a underline Apple would design.

Since CES 2018, we had been contrast a series of opposite nap technologies given nap was one of a hottest new categories during a uncover that year. we also knew that of a 3 pillars of health — nutrition, use and nap — nap was a one where we indispensable a many help. we already had fortify and a good slight for use and nutrition, and tech played an critical partial in that. 

I had been an early adopter of Fitbit in 2010 and switched to a Apple Watch to lane activity when it launched in 2015. we had also been regulating apps like LoseIt to lane my dishes and daily nourishment for scarcely as long. 

By early 2018, a tech attention had woken adult to a fact that nap was one of a subsequent frontiers where record could assistance urge lives. The CES Sleep Tech pavilion had all kinds of tech products directed during assisting people sleep, from special eyeglasses to high-tech nap masks to intelligent atmosphere filters to intelligent pillows to speakers for formulating a sound blanket. 

The initial product that we attempted out for tracking nap was EarlySense Live, when we was operative on a story about how their under-the-mattress sensor was being used to guard patients in hospitals as good as kids with asthma. It worked flattering well. It seemed to lane my nap rightly about 80% of a time and a app was flattering simple. 


The Apple Watch continues to supplement some-more health facilities over time.

Sarah Tew/CNET

A integrate months after CES, we also got a Sleep Number 360 Smart Bed. It had some facilities that done it a superb bed, like a ability to adjust mattress trust and lean so that my mother and we could any customize for a side of a bed. But a nap tracking facilities weren’t great. we usually found them to be accurate about 50% of a time and a information visualizations weren’t scarcely as notation as EarlySense. Several times a week a SleepNumber would skip tracking times when we slept, or would erroneously collect adult additional sleeping hours when my mother rolled somewhat to my side or a bed or a cat hopped onto a bed after we got up. 

All in a all, a best thing about SleepNumber’s tracking was that we didn’t have to wear anything, supplement anything or do anything extra. The best thing about EarlySense was a notation information visualizations that showed peculiarity of sleep, such as Deep Sleep, Light Sleep and REM Sleep. 

When we started regulating SleepWatch, we fast found it to be distant some-more accurate than possibly SleepNumber or EarlySense. In my personal usage, it tracked rightly about 95% of a time. Since a Apple Watch was on a physique and directly tapped into heart rate, that seemed to make it many some-more accurate. 

Read more: We demeanour behind during 5 years of a Apple Watch

I didn’t mind wearing a watch to nap in as many as we suspicion we would, mostly given a Sport Band straps on a Apple Watch were flattering gentle and so it wasn’t distracting or uncomfortable. The Apple Watch battery life also exceeded my expectations. we found that if we charged it for dual to 3 hours a day — when we was in a shower, reading during night before bed or while we was a assembly during a day — that was adequate to get a full day’s charge. 

All of that gave me a certainty to lane my nap any night and to trust a information we was removing back. So we set a idea of averaging during slightest 7 hours of nap per night. That done it like a diversion — like removing 10,000 stairs a day or shutting a Activity rings on a Apple Watch. And within a few months we was means to change my habits and routines so that we went from averaging 5 to 6 hours of nap per night to during slightest seven. 

Once we had softened a altogether volume of nap we was getting, we started to puncture into a other metrics that SleepWatch was tracking to know a peculiarity of my sleep. While SleepWatch didn’t lane REM nap like EarlySense, it did supplement a series of other indicators that went into daily SleepWatch score. These enclosed Total Restful Sleep Time, Sleeping Heart Rate Dip, 7-Day Sleep Rhythm, Sleep Disruption Percentage and Average Sleeping HRV. 


The SleepWatch app display unequivocally low HRV.

Screenshot by Jason Hiner/CNET

When we demeanour during any of these, we can click into them and see how your 30-day normal compares with other SleepWatch users. Once we got my nap adult to an normal of 7 hours per night, all of my numbers were in a tip 70th to 90th percentile — solely for one, Average Sleeping HRV. And that one was unequivocally bad, in a reduce 25th percentile (meaning 75% of SleepWatch users were scoring softened than we was). 

To be honest, we didn’t even know what HRV was. The SleepWatch app itself had a small bit of information built into a app. So, we review that, “Heart rate variability (HRV) is not a same as heart rate. HRV is a comparatively new and flourishing area of health research. HRV might exhibit information about your contentment that heart rate can’t.” It also said, “Health investigate suggests that aloft levels of heart rate variability during nap are compared with some-more childish physiology, softened nap quality, and reduction mental stress.” 

The app enclosed a few tips to urge HRV: devour reduction ethanol (I don’t drink), adopt a unchanging long-term use slight (I was already doing that) and use awareness activities before sleep. 

While we frequently used request and meditation, we tended to do many of it in a early mornings. So we started researching some-more about HRV, along with how mindfulness, imagining and low respirating could urge HRV. we schooled that a Apple Watch had only started tracking HRV with WatchOS 4 in 2018. 

I also schooled that HRV radically takes a beat of your shaken system. Another approach to consider about it is that it’s measuring a impact that highlight is carrying on your altogether health and contentment — something that’s routinely tough to quantify given lots of adults internalize things rather than behaving out. 

The Average Sleeping HRV reading in my SleepWatch information was observant that we had a potentially poisonous volume of highlight in my life and we indispensable to do a softened pursuit of handling it.

I started listening to a audiobook Breathing: The Master Key to Self Healing by Dr. Andrew Weil and started perplexing out a garland of imagining apps. we eventually began regulating Dr. Weil’s 4-7-8 low respirating technique before nap and we staid on Simple Habit as my favorite imagining app. we favourite that one given it was a many focused on shortening highlight and improving sleep. It also had a many giveaway calm so we was means to use it for a integrate months before giving my credit label to opt for a subscription. 


The HRV Tracker app lets we see a full day and uncover swell over time.

Screenshot by Jason Hiner/CNET

Basically, we started holding meditation, respirating and awareness as critical as my examination regimen. Gradually, my overnight HRV numbers started to urge in a SleepWatch app. But given we was focused on improving my HRV, we also wanted to lane it a small some-more closely and not only while we was sleeping, so we also downloaded a HRV Tracker app. Sure enough, we started seeing that when we had a stressful conflict, fight or setback, my HRV reading would mostly bottom out. 

But a Apple Watch doesn’t lane HRV constantly, and we wanted a softened approach to take a beat of my HRV manually. we schooled that a Breathe app built into a Apple Watch automatically triggers an HRV reading, so we started regulating that to get my HRV during opposite times when we was meditating or respirating during a day. 

It didn’t take prolonged for me to comprehend that a Breathe app itself is indeed a good apparatus for meditation, low respirating and awareness — generally when we delayed down a “Breath Rate” in a Apple Watch settings to 4 breaths per minute. Now, we keep tabs on my daily numbers with HRV Tracker — and not only my sleeping HRV. we frequently use a Breathe app for two-minute sessions via a day and I’ve churned it in with my other low respirating exercises and a brief meditations we do from a Simple Habit app. 

Read more: 9 local Apple Watch apps we should be using

With that, I’ve been means to boost my daily HRV averages from a mid-20s to a low-50s. That’s still not outstanding, though it’s many some-more normal and it continues to improve. The whole routine has also lerned me to know my physique better. we now comprehend when certain signals in my physique — that we would have formerly abandoned — are promulgation adult red flags to tell me we need to take impulse to exhale a small and reorient my thoughts. It’s been a plain quality-of-life upgrade.

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