I absolutely utterly completely and totally loved everything about this story.
First, Wilson's reading: like the others who've commented, I found the voice of the lost stranger absolutely perfect, sounding like a second person. And aside from that, the pace and sense of creeping menace conveyed was great.
Second, the story itself. It started, and I had that feeling that the story was familiar - though I can only ever recall the name William Hope Hodgson in conjunction with the Carnacki story over on Podcastle a while. As it continued, the feeling got stronger and stronger; and then there was the line about her finding some of the fungus on her pillow when she woke. That sealed it; I remembered that particular detail. Seeing as how I was driving and couldn't rely on my exocortex (i.e. my iPhone and its internet connection), I actually had to think, and I was sure I'd read it when I was a kid in a book of stories with an introduction by Alfred Hitchcock - and I think that reading that was one of my earliest introductions to horror fiction. So, I've gone hunting online and found that it was
Stories They Wouldn't Let Me Do on TV, edited by Alfred Hitchcock. And I've found it on Amazon.
So, thank you for a great reading; thank you for a great story; and thank you for reintroducing me to an old friend and bit of my own personal history in this genre.