the little boy was rolling over and over on the dewy grass , in a very bed-timish light ( but no one seems to mind wet grass or bed-time in that place ) , and the little dog was rolling over and over with him , and standing on his head like no dog on earth ever has done since mother hubbard 's dead dog did it ; and the little boy was laughing till he - vanished quite suddenly and left roverandom all alone on the lawn !