I think you're right, it reminded me of watching Dark Shadows and other similarly written and shot old soap opera reruns with my grandma. But it's really closer to the horror anthology single creator style like the influences you mentioned. There's an in-character commentary track too that's pretty good

I think the choice of a hospital in particular may have been influenced by the 1994 show Riget, directed by Lars von Trier, which was brought to English-speaking countries under the name The Kingdom (not to be confused with the 2014 show about MMA fighters someone else mentioned in a thread here). It's a horror show set in a hospital, and also kind of a soap opera, and also it's kind of supposed to be funny sometimes? That show...I guess I felt like it tried very hard, but also that conspicuous effort isn't a good look for something that's supposed to be unsettling. Which is kinda the feeling that Garth Marenghi's Dark Place takes the piss out of so effectively. I dunno, maybe it's my imagination, but I can't help but see them as connected.