The context of the following conversation is Robin decorated her room like the ocean, so you could say that Robin slept with the fishes.:
Robin says I absolutely love the ocean and all the lovely fish!.
The friend responds I can’t believe you decorated your room with fish..
Robin responds You know how much I wanted to do this, decorating my room was at the forefront of my mind..
The friend responds You did a tremendous job, I must admit, I feel like I am in the ocean standing here..
Robin responds That’s the whole idea!.
The friend responds Great job Robin!.