To be fair... after a long trip, I miss my own bed and pillow too... and it looks like the slime pillow thing has something to do with his "shadow" thing? Hope we get a better explanation about what that bit meant.
As much as I love Luca... we all know slime pillow would be the softer and plumper choice... oh and also there was that hollow setup in the last(or was it the last last?) chapter.