Untitled sleep peripheral
The untitled sleep peripheral is an unreleased Nintendo Quality of Life peripheral only known from a patent, and it's not currently known if the project will be brought to fruition. It can be seen in concept art connected to a device, possibly a Nintendo Switch or smart phone.
It was invented by Kazuhiro Hosoi, Eizi Kawai and Masahiro Kondo and is tied-in to the untitled sleep game. It is described as being able to project and display an image, and detect when the player is sleeping and awake.