Not sure if you're familiar with this or not, but that concept appears as part of the story in the novel[1] and movie[2] "Johnny Got His Gun". The premise is based on a badly injured soldier during WWI who has lost his ability to speak, see, hear, etc. He communicates by banging his head on his pillow in Morse Code. Many scenes from that movie are interspersed throughout the video to the song "One"[3] by Metallica.

[1]: https://en.wikipedia.org/wiki/Johnny_Got_His_Gun

[2]: https://en.wikipedia.org/wiki/Johnny_Got_His_Gun_(film)

[3]: https://www.youtube.com/watch?v=WM8bTdBs-cw