What happened?

What if it only takes a quick nap to change your world? It may be exciting, what if it isn't?

This narrates a thriller story of a group of young kids whose world drastically changed in one night of slumber with no vivid explanation.
With their lives constantly in danger, they have to live and survive in the "Lost World" and find a way to make sense of the whole situation before they can think of getting back to their normal lives.