Dozing off or Resisting Sleep?

Max knows he is not supposed to come into the house, and he also knows I am not strict in barring him from entering. Once he enters, he will nearly always rush to the stairs and plant himself on the ground. That's when I will relent and let him be. 

However he will feel cautious of me and watch my every movement in the house. In this instance, I think he was getting sleepy and resisting to sleep.