Books that are about or represent a slow descent into insanity?

I know the Shining is a big one here but I wasn’t a fan of it, personally. I started House of Leaves and enjoy it so far but I lent it to a family member, so I can’t finish it right now. The Haunting of Hill House was fairly interesting.

Examples of some movies that are similar to this concept that I enjoyed (for extra context on what I like) - Joker, Requiem for a Dream, Mother!, We need to talk about Kevin, Jacobs Ladder, In the Mouth of Madness, etc. You get the idea. This is the type of genre I enjoy.

So, if it’s horror or a thriller, that’s even better.

Preferably ones with an Audiobook version, because I’m looking for books to listen to at work.

Thanks in advance!

Quick edit: Wow I wasn’t expecting so many suggestions! Thank you everyone! I have so much to add to my list now and I’m excited to read them!