Testing Max's level of sleep

I was eating some chicken and there were a a few cartilege that I wanted to let Max have. As he was sleeping, I wanted to see how deep his sleep was. I placed the food in a container and placed it on his lower leg. He only flinched after I moved the container twice toward to upper part of his body. Even after he woke up, he just looked at it before deciding whether it is worth it to get up to eat the food.