That cat isn’t lazing out, it got trapped in the room, lay down in the corner when the oxygen finally started to run out, and has since been substantially mummified by the dry conditions…
I don’t know exactly what the cues are; but it just screams ‘dead, not sleeping’, and has the same sort of slightly-misshapen-and-missing-surface-detail aspect that certain sorts of mummies do have, especially the ones wrapped in a linen shroud and dessicated.
