I love Mahvesh Murad's voice! I first encountered it her in podcast, and it was a thrill to hear her narrate a story.
This story, wow. Harsh. Dark. Not much of a happy ending here for the protagonist, even though she managed to save her brother.
I didn't quite follow why letting the brother sleep allowed him not to be tormented by the old ones. I toyed with the idea that the Old Ones were actually a reference to Cthulu and brood, but I don't think that was the intent. Although that would be quite a mashup!