Japanese creative studio Konel has developed a sleepwear concept that uses embedded sound and lighting to promote sleep based on the wearer’s biometric data.
The ZZZN Sleep Apparel System was presented at Milan design week and developed in collaboration with data specialist NTT DX Partner and technology firm Soxai as part of a project aimed at improving sleeping habits in Japan.
Surveys have shown that its population gets the least sleep out of any country in the world.
Konel’s concept hopes to remedy this by encouraging power naps – a long-established practice, which can help to improve alertness, mood and performance in people who aren’t sleeping enough at nighttime.
The sleepwear utilises real-time biometric data gathered using devices such as Soxai’s Ring 1 smart ring to monitor the wearer’s sleep patterns, stress levels and heart rate to determine their optimal sleeping environment.
“In today’s hyper-connected society, where we are always online, the time we spend truly offline – both mentally and physically – is rapidly shrinking,” Konel said.
“ZZZN Sleep Apparel System introduces a new approach to rest: disconnect to recover,” the studio suggested, adding that their data-driven approach “helps individuals to return naturally to health”.
The clothing incorporates technologies that help the wearer to fall asleep at the appropriate time, including built-in headphones with noise cancellation.
The headphones play calming music with sleep-inducing frequencies that are tailored to the user’s stress levels in real time.
The apparel also features lighting that produces a soft red glow, intended to mimic sunset hues and create a soothing effect.
When it’s time to wake up, a soft blue light and more lively music played through the headphones help to gently rouse the wearer.
The apparel system is based on a Japanese garment called a yogi, which is shaped like a large kimono and is worn while sleeping.
Konel adapted this traditional design to create comfortable sleepwear that can be used on the move. The garment contains lightweight insulation and incorporates drawcords for easy adjustment.
The modular construction includes a detachable hood with an internal air pack that supports the neck. The headpiece, cuffs, hems and other features can be customised to suit the environment, temperature and the wearer’s sleeping preferences.
The ZZZN Sleep Apparel System is part of a pilot programme established by Japan’s Ministry of Economy, Trade and Industry to showcase practical, real-world applications for Personal Health Record (PHR) data.
The initiative aims to support the development of solutions that could help to alleviate issues relating to Japan’s declining birth rates and ageing population.
The project is currently at a concept design level and Konel is looking for co-creation partners such as apparel brands and material manufacturers to help develop it further.
The concept was initially unveiled at Milan Design Week and is now being exhibited during the World Expo taking place in Osaka, Japan, from April to October 2025.
The photography is courtesy of Konel.
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