A 'brainrot bedtime story' could be a story that has really strange, mind - boggling or very out - of - the - ordinary elements. It might be full of surreal ideas, like talking animals that live in a world where the laws of physics don't apply. It could also be a story that makes you think so much that it feels like your brain is 'rotting' in a sense, because it's being overworked with these wild concepts.
One example could be this. There was a man who, every time he closed his eyes to sleep, found himself in a world where the sky was made of water and the ground was made of clouds. In this world, he met a creature that was half - fish and half - bird. The creature told him that he was there to solve a riddle, or else he would be stuck in this strange world forever. The riddle was about the meaning of a song that only the wind could sing. So he had to search for the wind in this topsy - turvy world to find out the answer.