sleep-tracking
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The Bose Engineers Who Refused to Let Sleepbuds Die
Bose discontinued its beloved Sleepbuds in 2020. Three of the engineers who built them bought the idea back, raised roughly $28M, and rebuilt it as a sleep-data company hiding inside a pair of earbuds.
The Mattress That Wants to Run Cold
Eight Sleep's Premium Mattress is the quiet foundation under a smart-bed obsession - a five-layer, medium-firm base engineered to let cold water do the talking. Here is who should care, and who should keep their old bed.
Eight Sleep Pod 5: The $3,000 Fix for Couples Who Fight Over the Thermostat
The cover cools one side, warms the other, and quietly logs the night. Here is who should spend $3,000 on better bed climate - and who should buy a fan.
The Alarm That Wakes You Without a Sound
PAQ Wear's VibeRise is a soft fabric wristband, built by UC San Diego students, that trades the 6 a.m. blare of a phone alarm for a quiet buzz only you can feel.
The Water Bed's Grandnephew Wants to Cool Your Sheets to 55 Degrees
A husband's night sweats, a physicist wife, and a great-uncle who invented the waterbed. Two decades later, Chilipad is still the bed that hot sleepers whisper about - now on its second corporate life.
Sleep Number Put Software in the Mattress. Then the Business Lost Its Balance.
Sleep Number spent four decades turning a squishy air chamber into a connected health platform. Its technology found millions of sleepers; its expensive retail machine found a harder morning.
Ultrahuman
Ultrahuman is a Bengaluru-founded health-technology company building a subscription-free wearable and diagnostics ecosystem centered on its Ring AIR and Ring PRO smart rings. Beyond the ring, the company sells a continuous glucose monitor (M1), a home environmental sensor (Ultrahuman Home) and a blood-biomarker service (Blood Vision), stitching them into a single app that turns sleep, movement, metabolic and recovery data into personalized nudges. Founded in 2019 by Mohit Kumar and Vatsal Singhal, it is now the second-largest smart-ring maker by units sold and is expanding US manufacturing to challenge market leader Oura.
Fitbit Air 30-Day Review: The $99 Subscription-Free Wearable Tested
A hands-on 30-day review of the $99 Fitbit Air, a screenless, subscription-free wellness wearable. The reviewer wore it every day for a month through international airports, a week-long tennis camp in Bali, and intensive training in tropical heat, comparing it head-to-head against WHOOP 5.0. The verdict: the Fitbit Air excels at comfort and sleep tracking and offers roughly 80% of the value at 20% of the cost, but its thin, older sensor hardware lags behind WHOOP during high-intensity exercise, and the Google Health app is still rough around the edges.
Muse by Interaxon Inc.
Muse, made by Toronto-based Interaxon Inc., is a brain-sensing headband that turns clinical-grade EEG into a consumer wearable. First shipped in 2014, Muse reads your brainwaves and, through a companion app, gives real-time audio feedback to guide meditation, track sleep, and train focus. The company has since layered on fNIRS and SpO2 sensing (Muse S Athena, 2025) and an AI brain-health platform trained on more than a billion minutes of EEG data, positioning Muse at the intersection of consumer wellness and clinical neuroscience.
Sleep Reset
Sleep Reset is a San Francisco digital sleep clinic that brings the methods of an in-person sleep center to a phone. Built around Cognitive Behavioral Therapy for Insomnia (CBT-I), it pairs each user with a human sleep coach and a personalized, multi-week program instead of pills. Founded by serial entrepreneur Yunha Kim after her own years-long battle with insomnia and sleep apnea, the program was developed with researchers from Stanford, Yale and other institutions, and is used by thousands of people seeking a no-pill path to better sleep.
ŌURA
ŌURA makes the Oura Ring, a titanium smart ring that reads sleep, recovery, heart rate, temperature and activity from the finger. Founded in Oulu, Finland in 2013 and now co-headquartered in San Francisco, it has shipped more than 5.5 million rings, surpassed $500M in 2024 revenue and reached an $11B valuation in its 2025 Series E.
Tom Hale
Tom Hale is the CEO of ŌURA, the Finnish-American health technology company behind the Oura Ring - a smart ring that tracks sleep, recovery, and biometric data. A Harvard-educated technologist with 30+ years spanning Macromedia, Adobe, Linden Lab (Second Life), HomeAway, and SurveyMonkey, Hale came to Oura after a personal health crisis led him to the ring itself. He joined in March 2022 after writing a persuasive letter to the board after initially being rejected. Under his leadership, Oura has grown from a niche wearable to an $11 billion company on a path toward $2 billion in annual revenue, with the U.S. Department of Defense among its largest enterprise customers.