S’uimin

Transforming Sleep Monitoring Through IoT

S’uimin Inc. is on a mission to make sleep analysis easier, more accurate, and more comfortable. Founded by CEO Masashi Yanagisawa, the company developed InSomnograf, a wearable device that collects brainwave data while a person sleeps in their own home. Using small, sticker-like electrodes placed on the forehead and behind the ear, the device records more than 20 sleep indicators, ranging from time to fall asleep to time spent in deep vs. light sleep.

Unlike traditional sleep studies, which require overnight stays in hospitals or laboratories surrounded by wires and monitoring equipment, InSomnograf is designed for comfort and convenience. The device pairs with a proprietary AI platform to analyze brainwave data and deliver comprehensive, easy-to-read reports to both patients and physicians.

“We decided that in order to effectively evaluate sleep, it is necessary to look back on one’s perceptions while viewing objective measurement results shortly after waking up.”

Masashi Yanagisawa

CEO

S'uimin

The Challenge: Slow Data Retrieval and Delayed Results

In its early versions, InSomnograf stored up to a week of data locally. Patients would mail the device back, and results were processed manually – a system that delayed feedback for over a week.

This created two problems:

• Lost Relevance: By the time results arrived, patients often couldn’t clearly recall their sleep experiences on specific nights.
• Inefficient Workflows: Manual retrieval and QA slowed S’uimin’s ability to deliver timely care and prevented rapid iteration of the technology.

“We decided that in order to effectively evaluate sleep, it is necessary to look back on one’s perceptions while viewing objective measurement results shortly after waking up,” said Yanagisawa. “So we set out to create a specification that would allow the results to be viewed the next morning.”

The Solution: Direct-to-Cloud Data Transfer with Soracom

To eliminate delays, S’uimin integrated a communication module into InSomnograf, enabling direct uploads of brainwave data to the cloud. For this, the company turned to a trusted partner in Soracom.

“Since we were familiar with the Soracom platform and completely satisfied with the service, we decided to give it a shot,” said Yanagisawa. “The connectivity cost was low, and the Soracom team had excellent engineers as well as technical support, so we felt confident that we could rely on them if something went wrong.”

Using Soracom Air for cellular IoT connectivity, each device automatically uploads sleep data to the cloud every morning. Soracom Beam then streamlines communication between devices and cloud services by securely routing data without requiring complex device-side configurations, ensuring both security and efficiency.

The Soracom User Console gives S’uimin’s team full visibility into device performance and SIM status across the fleet, while tools like Event Handler automate maintenance processes and help optimize data usage.

These improvements have made InSomnograf more patient-friendly and increased its accuracy to levels comparable with hospital-based testing.

The Outcome: Clinical-Grade Results, Nationwide Reach

With Soracom powering daily data transfers, S’uimin has transformed how sleep studies are delivered- reducing turnaround from weeks to a single day and making high-quality sleep monitoring more accessible. Hospitals and medical centers now use InSomnograf as part of regular checkups, and sports organizations, including professional soccer teams, leverage it to optimize player performance.
The device is also attracting interest from the broader sleep industry, including companies producing sleep aids, beverages, and supplements seeking to validate product effectiveness.

“In the future, we would like to approach not only health check centers and manufacturers of sleep-related products but also those who are unsatisfied with their sleep, even those who aren’t yet aware of their sleep problems,” said Yuki Yamashita of S’uimin’s technology development division. “Eventually, we would like to develop a solution for improving sleep that can be widely deployed to individuals’ homes, as well as medical facilities.”