Someone sent this to me about four months ago, and I never used it for a Friday image. It's a fine picture, but it's entirely posed and therefore a bit fake. And a bit too sweet. And it's from the Sun (UK tabloid newspaper).
But the mouse is real; it's sleeping, in hibernation. It's also a dormouse - that's the species - so named because of its habit of going into hibernation, or in other words, going
dormant.