Monica Wakes Up

She frowned. 

After a long time, she opened her eyes and looked at the unfamiliar scene in front of her.

She seemed to have slept for a long time. It felt as if she had slept for a century and that she was still traveling through time and space.

For a long time, she could not remember why she was in such a place. She just stared at the ceiling until suddenly, she felt a warm breath on her face. 

Then, she turned around and saw a face very close to hers. She could only feel his even breathing because he was very close to her.

At that moment, he was frowning slightly. The black-rimmed glasses were still hanging on his high nose bridge. It seemed that he had forgotten to take them off and had fallen asleep.

The fatigue on his face was visible to the naked eye.

What had he experienced that make him so tired that he fell asleep immediately?