The only product I know is the second iteration of Bose Sleepbuds. It might not fit the bill though, and they're quite expensive imo. They call it noise masking

The only product I know is the second iteration of Bose Sleepbuds. It might not fit the bill though, and they're quite expensive imo. They call it noise masking tech, so it depends on what you're looking for, but they're meant to be a earplug replacement kinda thing. They feel amazing while lying down but that's all I know personally, the deal breaker for me is that you can't listen to what you want on them, only the sounds they've added in the app.