Polar Vantage M Science Test: Great Sleep and Heart Rate!

Рет қаралды 52,550

Күн бұрын

I tested the Polar Vantage M against a scientific EEG device, and tested the heart rate and step counting accuracy. Subscribe to my weekly Newsletter(!) on www.robterhorst.com
Instagram: / quantified_scientist
Twitter: @QuantifiedRob
👇Amazon Affiliate* (paid) links. Supports the channel, doesn't cost you any more!👇
Polar Vantage M: geni.us/0HhltOo
*My opinions are completely my own. However, I do earn a small commission if you purchase any of these devices via my affiliate links. It does not cost you any more money if you use these links.
The EEG tracker I used is called the Hypnodyne ZMax: hypnodynecorp.com/ from @HypnoDyne Corp
📹Apple watch videos📹
Sleep Cycle App: • Sleep Cycle App Review...
Steps: • Apple Watch 6 Step Cou...
Test: • Apple Watch 6 Accuracy...
📹First Garmin Venu Sq Video📹
• Garmin Venu Sq Heart R...
📹Oura Ring videos📹
Sleep Test: • Oura Ring Scientific S...
HRV Test: • Oura Ring Review: Hear...
Temperature Test: • Oura Ring Ultimate Tem...
📹Fitbit Sense videos📹
First look review and test: • Fitbit Sense Accuracy ...
Heart rate: • Fitbit Sense Heart Rat...
📹Withings Scanwatch videos📹
Unboxing and first review: • Withings Scanwatch Rev...
Sleep test: • Withings Scanwatch Sle...
Heart rate test: • Withings Scanwatch Hea...
Q&A with Withings: • Scanwatch Q&A: Answers...
⏱️This comparison is part of a larger project where I spend over 11 hours a week tracking everything in my life. If you'd like to know more:
• This mad scientist sca... ⏱️
Timestamps:
00:00 General intro
01:13 Results: Sleep Test Setup
02:45 Results: Sleep Test Comparison
05:26 Results: Sleep Test Overview
07:49 Results: Heart Rate Test
11:25 Results: Step Test
13:23 Conclusions
15:19 Limitations
🎵Music🎵
(1) Not Without the Rest by Twin Musicom is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/...)
Artist: www.twinmusicom.org/
(2) Wonders by JVNA
(3) Can’t Sleep (KZfaq Audio Library)
(4) Classique (KZfaq Audio Library)
(5) Blurry Vision (KZfaq Audio Library)

Пікірлер: 166

@TheQuantifiedScientist 3 жыл бұрын

*Subscribe to my weekly Newsletter(!)* on www.robterhorst.com Instagram: instagram.com/quantified_scientist/ Twitter: @QuantifiedRob 👇Amazon Affiliate links, support the channel!👇 Polar Vantage M: geni.us/0HhltOo Of course, only buy it if it makes sense for you!👍

@ioannispolitis7244 3 жыл бұрын

It would be nice to make a summarize video with benchmark evaluation about the accuracy among the various watches!

@TheQuantifiedScientist 3 жыл бұрын

Hi Ioannis! Great suggestion :-D . I might do something like that! Have a great day 😊

@marcelo_luz 3 жыл бұрын

Yes, I am also waiting for that! Lots of watched already tested. Time to put all together on the final battle with pro ands cons of each one.

@rolandrohde 3 жыл бұрын

Also, I would love to know which Fitness Watch has the most accurate resting heart rate measurement as well as training HRM

@mikispo1 3 жыл бұрын

Yes we absolutely need a comparison 💪 (however, great job as always)

@yildiraykomurcu 3 жыл бұрын

Please do not leave Samsung Galaxy Watch 3 out in that comparison !

@paulw858 3 жыл бұрын

I'm no longer looking for a new fitness tracker. I ended up getting the Apple Watch. But your manner of speaking and constant smile keeps me watching these videos despite me not looking for a new one!

@TheQuantifiedScientist 3 жыл бұрын

Thats so nice Paul! Thanks a lot 😊

@jackwilliams2010 3 жыл бұрын

Looking forward to your OpenBCI videos! Thank you for all your hard work and insights you share with the community.

@CalSR20DET 3 жыл бұрын

I've been waiting for this one since you posted on IG! Looks like Polar has a great grasp on sleep!

@TheQuantifiedScientist 3 жыл бұрын

I think so too!

@kayli9950 3 жыл бұрын

Literally an academic paper in video format. Love to see it!

@maciej_ma 3 жыл бұрын

Thank you for your very hard work. Your throughout testing ensured me that I've bought right watch for me. I bought Polar Vantage M almost half year ago. I've chosen it over other brands for accuracy of sleep tracking and that it has only sports features. I use it always with H10.

@shamsulazhar 3 жыл бұрын

Oh yeah, been waiting for this, thanks!

@TheQuantifiedScientist 3 жыл бұрын

Hope you enjoyed it Shamsulazhar !

@maximaleffort 2 жыл бұрын

Great video. Excited for the sleep lab.

@Thomasmcse 3 жыл бұрын

Thanks for the video. Great as always!

@TheQuantifiedScientist 3 жыл бұрын

Glad you enjoyed it Thomas!

@EVATUBE1 2 жыл бұрын

God I love your videos! time stamp not necessary as every minute is interesting and educational! still waiting for a device that can accurately monitor heart rate for strenght training.

@marcingoska4877 Жыл бұрын

Great video! Cheers Vienna 🍻

@HobbesCPM 3 жыл бұрын

Great video. I am very appreciative.

@Lukas_911 2 жыл бұрын

Hei! Thanks for the video. Just found your channel and your work is simply brilliant!!! Keep going!!!! Kind regards

@irmavanguard4097 3 жыл бұрын

Wow ,what an great Video you made!

@christoph_wattever 3 жыл бұрын

Interesting, thanks! Would also be interested in the HRV measurement accuracy. Polar's supposed to be good and some athletes even use it to steer their training

@Tiamo1519 3 жыл бұрын

Finally! Thanks rob. That was my Suggestion. I have same experiences with the good sleep detection!

@TheQuantifiedScientist 3 жыл бұрын

Thanks! Happy to hear it works well for you too!

@Tiamo1519 3 жыл бұрын

@@TheQuantifiedScientist hey rob. I Made a comparison of Sp02 over night between garmin venu and Apple Watch 6. Maybe its interesting for you too. Tim kzfaq.info/get/bejne/oqegpJpi2a-dfIE.html

@lordjojo77 3 жыл бұрын

Wow, great video !

@sammie2928 3 жыл бұрын

Would like to know the top 3 watches overall that's most accurate

@danielskripnik2030 3 жыл бұрын

I love your videos, really helping out with deciding which device is accurate for our personal reasons. Can you please do a video to test the new polar ignite 2 and maybe even with a comparison with the vantage M2 to see which one will be more accurate?

@boibluex12 3 жыл бұрын

Finally!!! A polar unite video!!! Well it's a vantage anyways... You saw my comments though!? Right!?

@kimmeng5830 3 жыл бұрын

look forward your review for the new Vantage M2 & Ignite 2, cheers!

@minh1391993 3 жыл бұрын

Great work, I am also doing my Ph.D. I really like the way you explain the measurement in a simple way for everybody. The way you organize the introduction of the experiment settings then go deeper into each criterion and finish up your video with the discussion and further plan make it like a scientific paper. But why there is no comparison across devices like the one with Apple Watch or Fitbit? Please post a comparison video if you have time. :D

@rodrigorios3271 3 жыл бұрын

Excellent video as usual! I’m not sure if you have noticed it but the Vantage V also monitors HRV during the whole night. It is not possible to export the data but I’m sure you can find a solution for that. 😬 It would nice to see how it compares to the Oura ring (benchmark).

@johnnyyoung8460 3 жыл бұрын

You are great! Thumbs up

@TheQuantifiedScientist 3 жыл бұрын

Thank you! Cheers Johnny!

@bederhajali 3 жыл бұрын

Hello my friend. As always great work. Would love to see some according to find data on the fit track watch from our favorite scientist. Hope you are safe and well.

@pierrethissen3759 3 жыл бұрын

Thanks for testing a Polar tracker

@atis1 3 жыл бұрын

This is so cool!! I am shocked that polar vantage M did worse at detecting training HR than apple watch! As they are specially designed as sports watch! Please do Polar vantage V and especially V2 analysis!

@Asthbendriel 2 жыл бұрын

what Apple does is black magic, no one get close, even Garmin with all their money and investment is nowhere as close, to be honest I have no idea how they differ the real data from fake readings on the wrist because of muscle tension, incomplete readings because of the intricate veins path on the wrist and the movement of the exercise, but they excel at it.

@yildiraykomurcu 3 жыл бұрын

3:51 For most of the people, it is tint of green, Rob :)

@Micloren 3 жыл бұрын

Excellent video. This watches sleep tracker looks very promising compared to others I’ve seen you review. Also... In each video I’ve seen so far I see you’re wearing what looks like an Oura Smart Ring. Are you doing an extended test with it, or is it your go-to for wearable sleep trackers?

@Chris-gq8ev 3 жыл бұрын

Polar calculates step counting differently. It is more an activity counter (even though they do list it as steps😒). They attempt to analyse all physical activity(biking, rowing, etc) and count activity that other trackers wouldn't accept as walking. Expect a lot of false positives. Love your videos!

@TheQuantifiedScientist 3 жыл бұрын

Thanks for the info Chris! I will do some research!

@notch5473 3 жыл бұрын

Yes I agree. Just got the vantage m2, and the so called steps count is horrible. Step count should only mean counting your steps and distance. Same thing for calories burned, way overestimated !! Polar should change this. I stopped wearing it 24/7

@pansam1053 Жыл бұрын

Perfect video! I like your video so much, and thank you for your effort I've been struggling lately whether to buy an Apple watch S8 or a Polar Vantage V2 i'm also curious to the POLAR VANTAGE V2 heart rate&sleep stage performance Will there be a chance for you to evaluate Polar Vantage V2 in the future? There is an index called ANS in its sleep function which i'm interested in, but apple watch doesn't have this. Besides, I also heard that Polar will release vantage v3 in the second half of this year (Maybe in September or October) or the first half of next year. Anyway, your videos support me a lot, thank you again!!🥰We support you !!!

@brettduce5243 2 жыл бұрын

Hi Rob. I really love your work. I was wondering if you could also show a Bland-Altman plot when comparing a watch to the gold standard. I find this easier to interpret compared to a simply X-Y plot. all the best. B

@joestram 2 жыл бұрын

Hi, Rob, love your videos. I enjoy purchasing and using smartwatches. I have just purchased the galaxy watch 4 and am not happy with it. While I am waiting on the charge 5, I was looking into buying a polar watch. Were you able to gather longer results for the polar watch? Thanks Rob

@resistcrew1149 3 жыл бұрын

Love this review!, would u say its better then the fitbit versa 3 in sleep tracking?

@RhythmAssistedPoetry 3 жыл бұрын

Hope you do Galaxy Watch 3. Love these videos 🙌

@yildiraykomurcu 3 жыл бұрын

Long awaited review

@daneomatic89 3 жыл бұрын

Please do a sleep test of the Huawei Fit :)

@user-wv9sc1uw8q 2 жыл бұрын

Great video thanks! Does the watch notifies on heart rate disorders?

@jokeyreid2748 3 жыл бұрын

Hello my friend. Firstly your videos are magnificent. In all the devices you have checked what one would recommend In detecting a rem sleep disorder? Any opinion would be fabulous. :)

@karlocirvencic3616 3 жыл бұрын

Great videos, make these comparisons on amazfit and huawei devices

@jasonyt5531 3 жыл бұрын

Good video, thanks! I have Oura and Vantage M. They tend to disagree about my sleep quality, thus tried to compare sleep tracking quality based on your videos, but charts were different (in Oura sleep test columns do not add up to 100%). Any advice on that?

@alliktaavo 3 жыл бұрын

You mentioned that you had indicated in the setting that you wear the watch on your right hand - during the step counting test when you changed hands did you also change the settings? This actually might influence the result: my M600 got a lap counting feature for swimming and if I wore it on the "wrong" hand then it wouldn't count anything, changed the settings and instantly worked again. Step counting is probably more similar left hand vs right hand, but there still might be some difference in Polar's algorithms. Something to keep in mind when doing the more extensive testing. Great choice of colours on the Vantage M - I recently bought one too and black/copper looks so good! ;)

@nucspartan321 3 жыл бұрын

Can you do a video looking at the heart rate monitor and sleep tracking of the Fossil gen 5's? I think they're the most bought wear OS watches

@gozzy25 3 жыл бұрын

I would like to see you test the Biostrap and compare it with your data.

@tommiel6740 3 жыл бұрын

Bedankt weer ! Zit te kijken en vraag me meteen af: “hoe goed is sleeptracking op de Garmin Fenix”. Ik heb de 5, en volgens mij klopt er weinig van.

@TheRealCoachRegg 2 жыл бұрын

Thank you so much for you great work. Could you please do a review on the Polar Vantage V2. Im considering purching it because i purchased the polar h10 after watching your videos. But i only trust your opinion and would like to see your scientific testing on it first. Otherwise ill be purchasing the GT Runner since i use android.

@rdnax5775562 2 жыл бұрын

Sleep interpretation is also a software thing... I could tell back then, without any measurements, that the good old V800 tracked better than the newer Fenix 5 (perhaps even my current 6X)... Fitbit ionic was correctly tracking even random sleep during day...

@IMM11 3 жыл бұрын

Brilliant. Soo witch smart watch is most accurate with heart rates il need it for running. Please answer me, and thanks a lot.

@nesvarigi 3 жыл бұрын

Always keen on those sleep tracking results! Would be great to see sleep tracking of garmin devices. I have worn Venu Sq and 245 at same night and results are completely different. I know you had VenuSQ. ;)

@TheQuantifiedScientist 3 жыл бұрын

Will do Atis!

@gianlucapirro 3 жыл бұрын

@@TheQuantifiedScientist Venu SQ or Polar Vantage M?

@0views372 2 жыл бұрын

Will you have any review coming for any of polars newer smart watches? Looking at getting one from them

@Micloren 3 жыл бұрын

Do you have any insight into how these wearables calculate sleep stages? I assume it’s some combination of heart rate, movement, or lack thereof (muscle paralysis). Or is it possible they have some weak sensor to detect brain waves to a degree? I’m just curious how they differentiate awake, light, deep, and REM.

@slevinkalevra 3 жыл бұрын

Do a test on the Polar Ignite 2 =)

@Pupendo999 3 жыл бұрын

Great content can you make test on Tic watch pro 3 ?

@darrenpardoe 3 жыл бұрын

Hi, Did you use the automatic detection of heart rate during exercise or the inbuilt modes?

@user-cn1rz3ft4q 3 жыл бұрын

Which was the best sleep tracker so far when it comes to awake times?

@user-qq4id8xd4p 3 жыл бұрын

thanks !

@TheQuantifiedScientist 3 жыл бұрын

You're welcome!

@IrfanSehic Жыл бұрын

After seeing maybe many of your reviews I got talked out of buying polar and Samsung watches many times because sleep tracking accuracy is not good enough. So I decided to look to see how much zmax costs. $4,000. It is probably worth it, but financial decision is a no. Thanks for good work, you are among the most useful people on the internet. if I had a channel that reviews watches I would delete my account because it's all nonsense compared to what you do.

@osazeeuhunmwangho8910 3 жыл бұрын

Good day, Please Mr Robert what watch will you suggest for someone who wants to monitor sleep tracking, heart rate?

@RationalCreed Жыл бұрын

can you explain the table in 6:10 please. surely each device only gives you 4 readings so how do you end up with a table of 4 x 4

@mthom100 3 жыл бұрын

I hope apple, garmin and other OEM's tracking devices manufacturer's are paying attendtion to your scientific analysis of their devices.

@Peakabike 2 жыл бұрын

Any plans to test the "ANS Recovery" provided by the Polar watches ? I got the Ignite for that two years ago and have found more actionable than say Garmin's "Body Battery".

@Vuitor 3 жыл бұрын

Nice job man 😎 Could you test the Garmin Fenix 6 Pro (HR, Steps and Sleep) ? Thanks 🙏

@TheQuantifiedScientist 3 жыл бұрын

Hi Vuitor! I would love to test it, but it might be out of my price range for the moment. Hopefully I can test it at some point 🙏🏽 . Have a great day!

@vinnybunny852 3 жыл бұрын

@@TheQuantifiedScientist Hey. I think you can ask them for sending a piece for review (not quite sure because it's out there for a long time already) or you can order one and test for a week and send it back ? If love to watch your comparisons on high end Garmin devices. I really look forward to your review about body battery working, heart rate accuracy and calorie tracking on fenix 6. Thanks for the review. Great job.

@ivt8 2 жыл бұрын

Still waiting for the thorough video about 8 nights sleep tracking accuracy of the Polar Vantage M

@DopeMazz 3 жыл бұрын

whats a great watch for step counter sleep tracking ?

@edinbrodlic4564 3 жыл бұрын

Any chance you might do a review of Beddr and its accuracy?

@rafaelpelle9104 3 жыл бұрын

Thanks Rob! I'm seeing a lot of your videos and now it's clear that if I want to accurately measure my heart rate during weight lifting I need a chest sensor. However, monitoring it in real-time on my phone would be inconvenient... Do you have any suggestions on watches that can sync with polar h10? I only know the more expensive polar and garmin watches, however it is much more expensive on the Brazilian market (currency exchange and import taxation)

@Asthbendriel 2 жыл бұрын

as far as I know this Vantage M can sync with the Polar H10 and nowadays you can get one for around $200, which is not dirt cheap but is fairly cheap for a multi sport watch with accurate measurements and good algorithms to track your health overall.

@georgemilev3244 Жыл бұрын

Hi, can you please make a review of the Grit x pro watch? Thanks.

@juanluisagp 3 жыл бұрын

Thank you very much for the video! What do you think about Nightly Recharge? It is a surprising fact and it greatly affects daily rest and sleep. It is included in the Polar.

@Asthbendriel 2 жыл бұрын

in my personal use after half a year, it's quite accurate, at least for me. When I did not listen to it when it asked me to slow down I ended injured, when I listened to it and changed my trainings based on the intensity suggested, I had very productive weeks. In fact, I'm in by best physical condition of my whole life after 6 months of wearing the M2.

@EdoardoBalestra 3 жыл бұрын

I am a Polar Vantage M owner and your analysis is really amazing! I also get 5-6 cycles per night, with some moments of wakefulness.

@petrescuework-difficultcas6581 3 жыл бұрын

Do you like it for the actual training / sports tracking?

@EdoardoBalestra 3 жыл бұрын

@@petrescuework-difficultcas6581, I've been using it for a short time, but it's nice. It is a pity that it has no notifications during the training.

@petrescuework-difficultcas6581 3 жыл бұрын

@@EdoardoBalestra Oh ok, I have to look further into it. I'd like some function like heart rate warning, if it goes too high during training.

@EdoardoBalestra 3 жыл бұрын

@@petrescuework-difficultcas6581 There is some sort of heart rate zone indicator, besides the normal bpm indicator.

@petrescuework-difficultcas6581 3 жыл бұрын

@@EdoardoBalestra That sounds good. What notifications do you wish for during training that the watch lacks?

@trailrunning7773 2 жыл бұрын

hallo my friend I want to buy a sports watch simply because I'm more interested in the subject of heart rate I want to know Which is more correct and reliable for running outside for cycling outside and inside and a few weights I'm interested in the Garmin forerunner 935 but also the polar vantage m more of the two you suggest me

@pastadicasa1570 2 жыл бұрын

Are you wearing scanwatch while doing this review?

@justincredible5406 2 жыл бұрын

Would you consider doing power lifting or weight lifting for your tests? :) It seems like it should be easier to detect.

@dreamingadream 2 жыл бұрын

I would be curious to see what you think of the Muse s or Muse 2 headbands that are supposed to track brain waves, heart rate, breathing, sleep and possibly more lol

@mathieur877 3 жыл бұрын

This is exactly what every data geek wants to know but will never have the courage to do

@padronefigoJr Жыл бұрын

Thanks, how about Polar Grit X?

@Jejejjenennen 3 жыл бұрын

Hi friend.. I underwent heart by pass 5 years before now I am 35 year old I want to buy smart watch for monitor my heart rate.. which is your best suggestion for me..

@baz4841 3 жыл бұрын

Please can you make a video about honor band 5 because i’m just so confused between it and mi band 5 as i’ve seen multiple reviews that honor band 5 is better in sleep tracking and heart rate measurements

@jamesbender874 3 жыл бұрын

Can you review the garmin connect sleep accuracy?

@MrDadonja 3 жыл бұрын

Doesn't he have an ant+? If you're wearing both, didn't he pick up the signal from the strip.

@ataolcay1999 3 жыл бұрын

Hello can you do the galaxy watch active 2 if you can I am wondering about the accuracy of its HR and sleep monitoring

@sdnalyam 2 жыл бұрын

I am sure a lot of people would like to know which is the best as for these relative high prices the products simply aren’t accurate enough.

@wilberthchaconalfaro7690 3 жыл бұрын

Please review the garmin venun 2

@painrelieverstech 3 жыл бұрын

Start to test VO2 precision!

@levi9731 3 жыл бұрын

Hey would you like test amazfit t Rex , honorband 6?

@ProjectSOG 3 жыл бұрын

Excellent video! What are your thoughts on the screen of the watch?

@ddamx 3 жыл бұрын

Enjoying the scientific approach to your reviews. Would it be okay to extrapolate these results to similar Polar wearables, like the Ignite and/or Unite? I take they use the same sensors and algorithms specifically for sleep and heart rate. I ask for those of us who may have a tighter budget to work with. Thanks!

@TheQuantifiedScientist 3 жыл бұрын

Hi Didier, I am not sure honestly. I would need to test them to be sure, which in some ways is a chicken and egg problem, since you would then have a dedicated review and your question would no longer be needed ;-)

@stijn1590 3 жыл бұрын

Great video Rob! Would it be safe to assume that other Polar watches, like the Polar Ignite are equally accurate in measuring sleep and heart rate?

@rudesyle 3 жыл бұрын

Yeah I was wondering about the M430

@Asthbendriel 2 жыл бұрын

Not a safe assumption, at least with Garmin, even watches with the same sensor but different tier model have different results.

@johntsav516 3 жыл бұрын

Hi , I like your videos very much , if it’s possible I would like to see a review of Garmin fénix 6 . Thank you !!!

@TheQuantifiedScientist 3 жыл бұрын

I will try John!

@johntsav516 3 жыл бұрын

@@TheQuantifiedScientist Thank you that means a lot , I’m trying to find a good multi sports watch with accurate data ( heart rate , sleep tracking etc.) and your videos help a lot !!

@bartekkrasowski4709 2 жыл бұрын

Can u test Vantage M2?

@sharamrasool1 3 жыл бұрын

waiting for the galaxy watch and mi watch review.

@umairhamza334 3 жыл бұрын

Please review samsung watch active 2 or watch 3

@joas162 3 жыл бұрын

Great stuff! I was just about to ask when you'd do a Polar watch vid ;) Curious about the sleep test, I have the Vantage V and I was wondering how accurate it is. Do you know if there's a big hardware difference between the V and the M if it comes to sleep tracking?

@Barncore 3 жыл бұрын

According to this they're the same: www.polar.com/blog/polar-ignite-vs-polar-vantage-which-polar-watch-is-best-for-me/

@joas162 3 жыл бұрын

@@Barncore Thanks!

@shehandamsara3695 3 жыл бұрын

Can you do a vedio about honor band 6❤🥺

@christopherpaul9319 2 жыл бұрын

First Column added to 100.1 😉

@davidtobin6563 3 жыл бұрын

Does it really seem likely to you that you had no periods of wakefulness in the test? Maybe there was more error in the eeg than the polar.

@nomoshiti 3 жыл бұрын

From what I understand he also films his sleep so if there's disagreement he would check the video.

@user-ki7vy6wy4y 3 жыл бұрын

haha thanks a lot for your vid. What i can do for you is to see a full of advertisement.

@flowercatful 3 жыл бұрын

It'll be most interesting to watch an evaluation on Huawei Watch GT 2 Pro. Which houses high grade materials and has a big team of engineers, scientists, mathematicians and designers behind its production of this model.

@blakeparkinson2168 2 жыл бұрын

I've recently bought a Vantage M2 and find that the sleep tracking doesn't work properly. It seems to not record when I fall asleep or if it does its around 4hrs wrong. Last night I went to bed at 10:30pm and it said I went to sleep at 0400... has anyone else experienced this?

@TheQuantifiedScientist 2 жыл бұрын

Hi Blake! Hopefully I can dive into more polar watches in the future!😊

@blakeparkinson2168 2 жыл бұрын

UPDATE: for anyone with similar issues I think I've worked out the problem. Polar allows you to manually let it know when you wake up by clicking into the sleep watch face. I've found if you click into this Polar seems to get upset and misreads your sleep pattern. Instead, I've found that syncing your phone to the Polar Flow app in the morning provides an accurate sleep tracking.