Mao obviously found that he was lying pretty comfortably and refused to wake up at first. It would almost seem like he got that streak from Shiro who was also bad at waking up. But as usual Shiro was oblivious to such a similarity, he just picked up Mao from his lap and put him on the floor. This woke him up just fine. Although he seemed a bit grumpy about not being able to sleep more on Shiro's lap he just walked to his cushion to nap a little more.