Can you explain this?
I am not sure that I can. I caught this scene a short time back. Sasha was, apparently, very tired and ended up napping under the Singer treadle sewing machine. As you can see, she was using the foot treadle as a pillow.
Personally, I think that is a little uncomfortable, but I guess that some dogs, at least, will be satisfied. It should be noted that a few feet away Sasha has a very nice dog bed with comfy blankets.
We would not want you to think that Sasha was obligated to use an iron pillow.