Spoiler alert!
okay so I've already had the nightmares up to the one where the cthulhu being was a rabbit in Ste's house, how do I progress further?
nope, it's in base game. First one is in the lizard temple, second is in your home third is when you go to ste's house, and get some likes until you get the option to ween the calves, then explore the playground at night, you should see a rabbit there. Then, you sleep--SLEEP not nap-- at ste's house. Not guaranteed, so you might have to try a few nights. Sorry I'm late