Mutes the sound of the Earthen innkeeper yawns / grunts / sighs, as well as the NPCs around the soaking pool areas.
The sound file ID lists consists of these:
5919534, 5919536, 5919568, 5919570, 5919572, 5919582, 5919588, -- innkeeper
5919848, 5919846, 5919844, 5919842, 5919839, 5919807, 5919805, 5919803, 5919801, 5919642, -- female bored/yawns
5919642, 5919640, 5919638, 5919636, 5919634, 5919632, 5919630, 5919628, 5919574, 5919566,-- male bored/yawns
6021056 and 6021070 consist of the player character /bored emote sound, so it's not included, and the NPCs don't appear to use this file ID anyway