Netherland dwarf rabbit! Hims so little.
Artist? This seems to have made the rounds through image sharing sites, but the original creator strangely remains a mystery. This is as far back as I could trace it and the link in the description leads to a nonexistent account on another image sharing space. As always, if you know anything about the original author, let me know.
'Cat Nap 2.0' by Daily Cat Doodles