I've never seen Ronnie do this, because I've never seen Ronnie sleep! That bunny is ready to come out of his cage no matter what time it is.
Billy, on the other hand, does this all the time...mostly when I'm trying to get him to come out of his cage. He flops, I poke him awake, he stretches and yawns at me, then he starts grooming himself so I think he's prettying himself up to come out, but no. He goes over to his food and water, then when he's done he flops again. This cycle continues from about 3 pm to 8 pm. He's become such a lazy bunny! :X