Note: update/correction - the Aura sleep mask has a feature called "Smart Duration" which means if a user listens to audio for around 90 minutes and then falls asleep, the mask will detect the (still) body movement and automatically use the audio to "ensure restful sleep and save battery." This is neat and perhaps signals there's actually a motion sensor/accelerometer inside :)
Note: update/correction - the Aura sleep mask has a feature called "Smart Duration" which means if a user listens to audio for around 90 minutes and then falls asleep, the mask will detect the (still) body movement and automatically use the audio to "ensure restful sleep and save battery." This is neat and perhaps signals there's actually a motion sensor/accelerometer inside :)