The Eternal Day

The Eternal Day is a day that never ends that was cast by Sunny with the help of Luna. It is happening during the entirety of Sun of Hopes and 10 years after the events of MOON, only ending after Colt and friends defeat Sunny in the Dreamy Factory.

Difficulties with sleeping
It is really hard to sleep during it due to night not existing.

The catastrophe
If the Eternal Day stays for too long, the world will become so hot that it will burn down and become impossible to live in.

The Legend of the Hopeful Sun
Deep in the Diamond Caverns, there is a legend that talks about a hero that would bring an end to the eternal day. It reads:

The never-ending day that plagues the world and would end in a terrible catastrophe that would make the world uninhabitable has a way to end.

Years later, there will be a hero, destined to bring an end to this chaos.

They are the King's child, and they would ally with two to four more creatures, and defeat the terrible causer of this eternal day.

And then, night would come back and everyone will be able to have a peaceful sleep again.