Ozlo Sleepbuds Earbuds for Sleeping with Noise MaskingThe Ozlo Sleepbuds are in ear sleep devices that use passive noise isolation and sound masking to reduce environmental noise during sleep. They were developed by former Bose engineers and use the same core acoustic approach as the discontinued Bose Sleepbuds. Each earbud contains small biometric sensors that detect when the wearer falls asleep. When sleep is detected, playback automatically transitions from streamed audio to built in masking sounds