This poem expresses a feeling of introspection and awakening. "Sitting up in a midnight dream" refers to waking up from a dream in the middle of the night, which is caused by touching or thinking. "A big country is actually myself" implies that I am also one of the big countries, which means that I am aware of my potential and ability, as well as the strength and status of the country. "The rise of a great power means waiting for Japan" expresses confidence and expectation for the rise of the country, and thinks that it is only a matter of time before the rise of the country is coming. The whole sentence conveys a person's awakening and introspection in the middle of the night, realizing his identity and the potential of the country and firmly believing that the country will rise. It expresses confidence and pride in the country and reminds people to make constant efforts for the rise of the country.