He's not in his room, nor is he in any of his known napping spots! Of course, his known napping spots include practically every place on the ship, so it's been a long search!

[Her suggestion is interesting. Sans's first trip down there turned out pretty badly, and he hadn't considered the possibility of him going back.]

It's been more than a day, so I don't think so, but... have you seen him on Amisses-Re?