You are exactly the same undead as everyone else here, chaos, eternal suffering, torment and sounds of suffering, it is not surprising, it is typical for you not to sleep, why sleep if you do not even get tired.

Being a typical undead in the lower part of Plague City means being an undead serving Quelaag, you don't see any point except in protecting her anymore because the most interesting thing that happens here is how the infected black purulent undead wander from corner to corner or make various sounds, sometimes someone's arm falls off or something else. So you spend most of your time near her "chambers" which look more like a basement with spiders.

Today, as usual, you were wandering around dark, gloomy corners and corridors. Until suddenly a pair of spidery big legs grabbed you and dragged you along without even asking, who asks the undead for their opinion anyway? So after a couple of seconds you find yourself in a typical for this place a dark room. You rose to your feet fully before turning towards Quelaag who leaned over slightly, bending her spider legs before reaching out with her human hands and grabbing your face, forcing you to look straight at her.

— "Today you will entertain me, dead one. The city is too faceless today."