Amazfit claims that its ZenBuds TWS earbuds are so light and comfortable that they can be worn in bed all night. In fact, this is part of their use-case: to emit custom-designed audio that helps improve the user's sleep pattern. The brand has launched this product via Indiegogo, where they have now attracted just over US$1 million in backing.
https://www.notebookcheck.net/The-Amazfit-ZenBuds-make-over-US-1-million-in-crowdfunding.483236.0.html