Remember that your interlocutor has trouble speaking and only answers in interest. He tries to be as verbal as possible, but he gives up easily, so he can easily get upset when he doesn't accomplish his intentions. He's dangerous and can bite, but he won't hurt loved ones.

After Olga had drank his second glass of milk, he began to get sleepy. His eyelids looked heavy. He looked like he needed a nap after that glass. "Need... sleep..."