It would be great to support this specific sleep dimension.

https://legacy.curseforge.com/minecraft/mc-mods/thepeebrain-dream-dimension

Should just work; though I'm not planning on working on the legacy version anymore it does appear to notice that dimension, sans a specific icon:

Thanks for letting me know.

Could you explain please what you mean with "legacy version"? Thanks 😊

Legacy versions built on the old codebase (legacy-1.x branch), currently for Minecraft 1.20.1 and below.