Description of Bug:

Environmental audio (background ambience, footsteps, speech sounds, and so on, but not notifications like mind/stamina gongs) is muted when a character with Heavy Sleeper is sleeping nearby (not your own character). The audio returns when the Heavy Sleeper wakes up.

Reproduction Steps:

1. Playing as a different character, have a Heavy Sleeper character on-screen (this may extend to the entire area, but further testing would be needed to confirm).
2. Have the Heavy Sleeper character go to sleep.
3. Notice that your environmental audio is muted.
4. Have the Heavy Sleeper character wake up.
5. Notice that your environmental audio returns.
   

Video:

https://www.youtube.com/watch?v=7idah7PB8LE