Rin gives a haughty toss of his head.

"Nope, I'm completely serious. I mean, we can if we want. But usually just resting in a spot for a while is good enough for us. Plus, it's kind of hard for us to keep our gills working if we're not moving for too long. I honestly thought that's how all mers did it. Do you really need to sleep? Like actually sleep?"

Haruka does look tired...