I wear four sleep tracking devices at night. FWIW, I am a terrible sleeper. Here is a table of some of the data for the four devices from last night. I really can’t assess which device is most accurate. I would like to believe the Garmin Index Monitor is but I don’t know.

I have multiple wearable devices. Three smartwatches: Samsung Galaxy Watch Ultra (2025), Garmin Forerunner 970, Amazfit BIP 6; two heart rate monitor straps: Garmin HRM Pro Plus, Polar H10; two rings: Samsung Galaxy Ring, RingConn Gen 2; and two straps: Amazfit Helio Strap, Garmin Index Monitor. They all depend on software, which is not great IMO, and they have a lot of functionality overlap. Yet they often report different numbers for the same thing. The one that drives me most crazy is that my heart rate on one device could show 170 bpm when I am running, and another device might show 120 bpm. The technology is still evolving. It isn’t mature yet.

There is a YouTuber, The Quantified Scientist, that tracks these devices. His home page is

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Dia is available on MacOS. We’ll reach out when that shifts.

How AI is helping one doctor treat cancer: ‘It’s moved out of the hype phase’

Britain’s first clinical professor of AI in radiation oncology says tech is improving care — but waiting lists still grow

Read the full story (Financial Times): How AI is helping one doctor treat cancer: ‘It’s moved out of the hype phase’

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Apple Watch New Blood Pressure Feature
The feature can alert users if signs of chronic high blood pressure/hypertension are detected, according to Apple. Based on data from the Apple Watch’s optical heart sensor, the feature can analyze how a user’s blood vessels respond to the beats of the heart. The algorithm works passively in the background, reviewing data over 30-day periods, and it will notify users if it detects consistent signs of hypertension.

Apple said the feature underwent “rigorous scientific validation.” According to the company, it was developed with advanced machine learning and training data from multiple studies totaling more than 100,000 participants, and its performance was then validated in a clinical study of more than 2,000 participants.

If your Apple Watch detects patterns of hypertension, you receive a notification to discuss with your healthcare provider. You are also prompted to use a third-party blood pressure cuff to take measurements over a 7-day period. You can set up reminders for the morning and evening.
Receive hypertension notifications on Apple Watch - Apple Support

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Somnee Launches Next-Gen AI-Powered Smart Sleep Headband for Faster Sleep, Deeper Recovery, and Optimized Sleep Performance

Sep 16, 2025 2:53 PM Eastern Daylight Time

The second-generation AI-powered headband offers a more comfortable design for all-night use, enhanced user experience, and advanced sleep features to address the growing global sleep epidemic

Just ordered the Elemind last week. Seems like Somnee incorporate a number of Elemind’s best features. Seriously thinking about returning the Element and springing for the more expensive Somnee ;-(

BERKELEY, Calif.–(BUSINESS WIRE)–Somnee, the award-winning sleep technology delivering pioneering AI-powered neurotech and software that improves sleep, today launched the highly anticipated second-generation smart sleep headband and revamped service, designed for deeper, faster sleep and optimized performance. Launched in 2022 by renowned sleep expert, Dr. Matt Walker, PhD, and an esteemed group of scientists from the University of California, Berkeley, Somnee is a closed-loop sleep aid that tracks your sleep with lab-grade sensors and uses gentle neurostimulation to help you fall asleep faster and maintain deeper, more restorative sleep. Somnee offers a first-of-its-kind, targeted solution for the nearly one in three adults who suffer from poor sleep.

Introducing Second-Generation Smart Sleep Headband and Service

The new Somnee headband builds on the award-winning technology of its first-generation product and now combines clinical-grade overnight sleep tracking using electroencephalogram (EEG+) with Somnee SmartSleep AI for personalized neurostimulation, along with an enhanced app-based service for a more seamless user experience. The headband has been completely redesigned with a comfort-first form factor for all-night wear, helping users fall asleep faster and maintain deeper, more restorative sleep for peak cognitive performance throughout the day:

  • Expanded Sleep Tracking – Overnight EEG+ and proprietary AI/ML powers key sleep quality insights and personalized neurostimulation for higher quality sleep support.

  • Pillowy-Soft Comfort – Reimagined with a soft, pillowy design that adapts to you for all-night comfort, no matter how you like to sleep.

  • Bone Conduction Speakers – Enjoy an intimate, immersive, comfortable listening experience that only you can hear, with meditative audio curated by Dr. Matt Walker.

  • Nap & DriftBack Sessions – Support for short, restorative naps, day-time sleepers, and middle-of-the-night wakeups, designed to help you fall back asleep in half the time. Now available phone-free.

  • Phone-Free Experience – Launch your sessions entirely phone-free with the click of a button, reducing screen time and blue light exposure before bed.

  • Reengineered Companion App – Enjoy a streamlined setup, crisp personalization tracking, lab-grade reports, and actionable insights tailored to each user’s sleep patterns.

  • Dr. Matt Walker’s Sleep Journal – Easily log and track key sleep health indicators with the same qualitative and quantitative evaluation methods Dr. Walker uses in sleep studies.

  • Somnee SmartSleep AI – Next-gen algorithms and proprietary AI enable personalized brain mapping, real-time monitoring, and AI-powered interventions.

  • Somnee API – For select researchers, partners, enterprises, trainers, and clinicians in 2026.

“The second-generation Somnee is a revolutionary leap forward in closed-loop sleep technology. We took everything we learned—from our passionate Gen 1 community and research pilot with the NBA—and poured it into creating the most advanced, AI-powered sleep wearable on the market. One that uses clinical-grade sensors with a closed-loop approach that actively adapts and improves sleep,” said CEO Tim Rosa. “This isn’t just an upgrade—it’s a whole new standard for how we approach sleep. Whether you’re a high performer, a wellness-minded professional, or someone battling sleepless nights, Somnee is here to change the way you rest, recover, and live… so you can sleep more, to live more.”

Company Website:

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Please post your sleep results with either one that you end up trying / using…

$549, I hope it delivers good results at this price, though I notice they have a 45 day return policy.

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It was a total dumpster fire.

AI is good when there isn’t bad software anymore.

Is it a one-off cost or a subscription service? I may try it if it is one-off.

$549 to purchase. No subscription.

In the text below it said “no monthly”, “Includes … annual membership”, it has an annual subscription (or you can choose monthly).

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Elemind 1 week in…

  • marginally shortens time to fall asleep.

  • may more consistently help falling asleep

  • longer deep sleep

  • several days of longer REM sleep

  • failed at to worsened my ability to fall back asleep after waking up, down to 5-6 hours sleep per night.

  • marginally shortens time to fall asleep napping (which I do more of because 5-6 hours).

  • comfortable to wear all night

  • pretty good app, but could benefit from stealing some of Oura’s sleep reporting.

  • control buttons to start, restart, and raise/lower volume don’t have enough tactile identification. They would benefit from raising the indicators on each button so you can readily identify them by feel.

Recently started Compounded Semaglutide. Still on the lowest dose. Not certain why this would affect getting back to sleep given I can pretty readily fall asleep at night or to nap.

I’ll up my dose of melatonin when I wake up in the night to see if that helps.
Maybe do more consistent HRV training.

All said, unless I experience a real turn around with the Elemind, I’ll order the new Somnee.

I would like to see a good review of the new Somnee. The original had issues with the electrodes that you needed to replace each week, including their degrading performance over a week.

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Can you share more on this?

Not enough of a sample yet for anything conclusive, but even on the nights I don’t fall back to sleep, I’ve seen deep sleep (as measured by by Oura ring baseline) increase by 60% to 100%.

FYI

Last night, I upped my melatonin dose on waking in the middle of the night and managed to get a full 8 hours of sleep.

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No turn around. Returning Elemind. Ordered Somnee.
Will advise.

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Pregnancy Surrogate Robots have been invented in China. Essentially an artificial womb and a bit different from the picture. No need for a head, hands or arms.

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China develops bone glue for broken bones.

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Japan develops artificial blood. Plasmapheresis anyone?

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Somnee 2.0, 9 days review

I returned the Elemind (restocking fee + return postage = $40, which seems outrageous for something that didn’t work).

Ordered the Somnee 2.0.

I really want this device to work. I may even need this device to work.

ISSUES

To date my experience with Somnee has included:

  • Incomplete/inadequate documentation. They don’t take you through what happens clearly, what happens after synching and processing data, why it does what it does.

  • Failure of the company to clearly disclose prior to purchase that one can only use the device for one sleep session + one DriftBack session in a 24 hour period.

  • Failure of the company to clearly disclose prior to purchase that the app doesn’t “stitch” together Sleep and DriftBack sessions for a full night’s reporting. One has to end the primary “Sleep session” which ends the data continuity through the night then start a “DriftBack session”, which usually doesn’t work.

  • Non intuitive app.

  • Defective hardware, firmware, and/or software. Hard to tell which.

  • Defective electrodes. Disposable electrodes that one needs to change after three nights use. The problem… the silicone pads attached to the electrode strips fall off, sometimes after a single night.

SOME DETAIL

The company responded to one of inquiries:

When you don’t wear your Somnee headband overnight and have clean, consistent sensor contact, you’ll receive a stim report that breaks down how effective your 15-minute neurostimulation was in preparing your mind for more restorative rest."

Actually, you get this report after every night until the app and the cloud process your sleep data a process which can take hours (see screen shot on the left)

SCREEN SHOTS

OK, except, I can find no information about what the numbers for the following measures actually mean (see screen shot 2nd from left):

  • Sleep readiness
  • Sleep onset
  • Estimated maintenance
  • Estimated depth

None of the above specifically defined on their website or in the scant accompanying documentation.

Apparently these represent %s.

How does the value of ”38”, in the left screen shot above, relate to what the graphic shows? Pre Stim on the right Post Stim on the left, what does this mean?

TIME TO SLEEP

Far more concerning, 2 mornings ago after synching the headband and waiting over an hour, the sleep data (see the screen shot 3rd from the left) tells me that I fell asleep in 0m.

Simply not true. Prior to sleeping one goes through a 15 minute stimulation. During the stimulation I read. Following the stimulation, I had to remove my AirPods (which I need to use so I don’t keep my wife awake with the music that plays during the synch), plugged in my phone to charge overnight, put in ear plugs, got up go the bathroom, got back into bed, and put on eye shades to settle into sleep, which did not come quickly.

Something in the device’s monitoring doesn’t comport with reality.

FIRMWARE UPDATES

In 9 days of use the device has prompted me to do 3 firmware updates. This suggests they do things on the fly rather than have deliberate update/release cycles.

It further suggests a company overwhelmed by complaints and user issues.

Bad sign.

MAJOR CONCERNS

I questioned the company as to whether they even have objective beta testers.

The device and everything that supports it don’t appear ready for distribution.

As currently designed the device relies on your subscription model to process and report data and to supply electrodes.

The issues and range of issues I’ve experienced and reported to them lead me to concerns about the viability of their business.

More importantly, I have no tangible evidence that I have benefited at all from the use of the device although I appreciate that this make take more time for the device to incorporate its reading of my unique brain wave patterns (call me skeptical).

Again, I want this device to work.
I’ve provided feedback hoping that in can help the company resolve the issues.

Not ready to give up yet. I think the device holds promise. I just don’t know if this company can get its act together.

I very much respect Mathew Walker. That said, I don’t think he understands what a company needs to do to deliver a properly operating product. I hope he and they can learn.

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I hope it works for you. I am very skeptical of such devices, I have seen no convincing evidence that they are useful for anything. Btw. as I’ve stated before, I’m not a fan of M. Walker, he makes assertions about sleep that he presents no evidence for and is a self promoter. But to each their own.

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