December 20, 2021
NAGASE & CO., LTD.

Investment in S’UIMIN Inc., Developer and Provider ofBrain Wave Measuring Wearable Devices and Sleep Measurement Services
NAGASE & CO., LTD. (Chuo-ku, Tokyo; Representative Director and President: Kenji Asakura) has
made the decision to invest in S’UIMIN Inc. (Shibuya-ku, Tokyo; Representative Director and President:
Masaaki Fujiwara), which provides a sleep measurement service using brain wave measuring wearable
devices and AI technology.
S’UIMIN Inc. (“S’UIMIN”) is a startup company out of the University of Tsukuba, established in 2017.
S’UIMIN developed and provides a wearable device that measures brain waves, and InSomnograf®, aservice that utilizes the data obtained from the wearable device, providing highly accurate visualized sleep
condition reports using automatic AI analysis based on a unique algorithm. Sleep studies using brain
waves are generally done using polysomnography (PSG), but PSG requires the subject to undergo
uncomfortable testing conditions including sleeping with sensors and electrodes attached to their entire
body, and also requires staying over at a hospital or test facility. Not only is PSG physically burdensome
for test subjects, but it also requires manually analyzing the obtained data, thereby increasing workload
for technicians. The wearable devices provided by S’UIMIN can be attached by the subjects themselvesat home, while providing comparable measurements to existing PSG tests*1, and also reducing the data
analysis related workload through automated analysis.
With this investment in S’UIMIN, NAGASE & CO., LTD. sees potential for use in product evaluation formakers of home appliances, beds, bedding, and food products, as well as for health managementbusinesses for corporations, and will develop the B2B market.
As a “business designer that creates a sustainable future” beyond the bounds of “chemistry” or “a tradingcompany,” the NAGASE Group will contribute to a sustainable world where people live with peace of mind.
*1: In a study of 50 healthy subjects, simultaneous measurements were carried out with the brain wave wearable devices
and PSG tests, and a comparison of the concordance rate over a set period of time for the PSG results of clinical technicians
found an average concordance of 86.9%.
(Source) Abstract of the 46th Meeting of the Japanese Society of Sleep Research (September 2021): “Development of ahome sleep brain wave measurement service and test results at a health facility” (Tetsuro Hiei, S’UIMIN Inc.), “AI automaticstaging of sleep brain waves” (Kazumasa Horie, University of Tsukuba Center for Computational Sciences）

Measurement is possible by simply attaching the device to the forehead and behind the ears

■ Overview of S’UIMIN Inc.
(1) Company Name S’UIMIN Inc.
(2) Head Office

Shibuya-ku, Tokyo(3) Representative

Representative Director and President: Masaaki Fujiwara(4) Established

October 17, 2017(5) Business

Wearable devices that measure brain waves for sleep analysis, and sleep

Overview

measurement service utilizing AI automatic analysis(6) URL

https://www.suimin.co.jp/◆For Inquiries About This Press Release
NAGASE & CO., LTD. URL: https://www.nagase.co.jp/english/<Inquiries About Business>
Pharma-Medicals Div., Life & Healthcare Products Dept.

Tel: +81-6-6535-2327<Inquiries About Press Release>
Public Relations & Branding Office, Corporate Communication Dept. Tel: +81-3-3665-3640