Matt Cronin

Founder & CEO, Somnus. Private, on-device sleep tech. Modern AI, kept honest. Building the infrastructure layer for sleep and the airway.

[Matt Cronin @MattCronin]

1/ A customer sued Oura this week. $514 ring, promised to track her sleep stages. Her complaint: it has "a coin flip's chance of being correct."

I've worn these for years. I read all 53 pages. Here's what's actually going on. 🧵

2/ The "coin flip" isn't a lawyer's flourish. It's a 2025 study in Scientific Reports: Oura scored 53.18% accuracy on four-stage sleep classification against a real clinical sleep lab.

3/ Why? The complaint's sharpest line: "sleep happens in the brain, not on one's finger."

Sleep stages are defined by brain waves, eye movement, muscle tone. A ring measures pulse, motion, temperature. Then it estimates.

4/ Fair counterpoint: these rings ARE good at sleep-vs-wake (~85%). The weak spot is specifically which STAGE you're in. Big gap between "you're asleep" and "you're in REM."

5/ The paragraph nobody quoted: the complaint says responsible companies either use real sensors OR don't overclaim. The ones who get sued did neither. That's a design principle disguised as a legal one.

6/ It's the line we built Somnus on. Nightsong listens, acoustic signal, snoring and airway events that physically reach a mic. On-device. We measure what's there instead of inferring what isn't. Your recordings never leave your phone.

7/ Sleep tech goes from <$7B to $25B this decade. The temptation: borrow medicine's language to sell a gadget.

Winners will be the ones whose marketing never wrote a check the sensor couldn't cash.

[Matt Cronin @MattCronin]

This is a 61.
Most apps would hide it behind a cheerful ring and a streak.
Nightsong shows the number: soft night, hard habit, keep stacking.
No trophies. The honesty is the feature.

[Matt Cronin @MattCronin]

I still wear a ring. I won’t renew. A major wearable IPO just got postponed.

Not about the ticker. About the category. Trend vs measurement. A sleep score that doesn’t match how the night felt.

Nightsong by Somnus Tech…acoustuc signal on your phone. When we didn’t hear enough to score a night, we say so.

The night still happens tonight.

[Matt Cronin @MattCronin]

@cb_doge Agree

[Matt Cronin @MattCronin]

@elonmusk Agree and worth seeing it on your own nights. Nightsong™. https://t.co/WOKQf2mguz

[Matt Cronin @MattCronin]

@ConceptualJames Read the whole thing. @MarioNawfal deals in soundbites and the algorithm pays him for it. This reply earns the long read. Agree completely with @ConceptualJames

[Matt Cronin @MattCronin]

@valuetainment https://t.co/3ZHQz6f2XP

[Matt Cronin @MattCronin]

https://t.co/WOKQf2mguz

[Matt Cronin @MattCronin]

Apple’s new CEO: intelligent personal hub.
iPhone center. Home screen next.

Us: night layer first.

Nightsong. On device. Real Index or no number.
5,000+ hours. 700+ nights. App Store fall.

Wellness. Not a medical device.

[Matt Cronin @MattCronin]

8/
Next year's list won't be won on more data. It will be won on data you can trust and data you own.

[Matt Cronin @MattCronin]

1/
Apple owes Masimo $634 million over one sensor in a watch.
TIME just named its top HealthTech companies of 2026. The list rewards one thing: who tracks the most.

It never asks the two questions that matter. 🧵

[Matt Cronin @MattCronin]

7/
It is why we built Nightsong to measure the sound of your breathing instead of guessing at your brain.
It runs on your phone and nowhere else. Your recording never leaves it.

[Matt Cronin @MattCronin]

Nightsong is a wellness product. The Somnus Index is a wellness metric under FDA General Wellness Policy. Not a medical device, and not a diagnosis.

[Matt Cronin @MattCronin]

1/ GLP-1s are changing weight fast. Almost nobody's measuring what they do to your sleep. Lose weight and your airway changes. Snoring and breathing shift. You feel it at night before the scale shows it.

[Matt Cronin @MattCronin]

3/ Over 630 nights, 4,500 hours, 33 phones. No marketing. Just people who wanted to know what their nights were really doing. On a GLP-1? Tell me what your sleep is doing. I know what I'm seeing.