It was 4 in the morning. While the people of Zion city were sleeping, their new ruler, the Dragon Monarch, and his companion were busy vanquishing another neighboring Empire.
After the Chaos that Aditya, and the four generals caused in Zion city, things have finally calmed down. The people of Zion city were assured that no one was going to attack them. This assurance gave them the peace that they needed to fall asleep. Otherwise, there is no way that the people of Zion city would be able to sleep peacefully knowing that they were trapped within a barrier and there was no way for them to leave this island.