The person who developed Apple’s night shift function, which illuminates the iPhone screen at night with wavelengths friendlier for sleep, has left to focus on sleep technology elsewhere, CNBC reports. 

Last month, Raymann left the company to head up a start-up called SleepScore Labs. He told CNBC one thing he was excited about was more networking with fellow sleep professionals. “Apple is a little more inward focused,” he said. “I was intrigued to be part of a fully dedicated team.”

Sleep-monitoring technology is a huge potential market for Apple and other technology companies. An estimated 50 to 70 million US adults have sleep or wakefulness disorders, according to the CDC, and millions more intermittent experience periods when they suffer with sleep.

A variety of new apps and devices have emerged, claiming to track sleep and provide insights in how users can feel more rested. Some of these are of backed by more evidence than others, said Raymann.

Among the highest-quality, according to Raymann, is his new venture. The startup was initially developed by Mehmet Oz, the physician and television personality, and ResMed, a medical device maker. SleepScore’s $129.99 sleep sensor integrates with any platform, including iOS and Android.

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