During the day, some people have a smooth journey, and some people are unlucky. No matter which one they are, they must have some unspeakable troubles, and those troubles become your dreams at night.
Accumulate day by day and nourish night by night.
So, when you can't solve it, he becomes a "nightmare".
It erodes your soul bit by bit, but you have no way of knowing it. You just feel that life is getting more and more tiring, more and more difficult, and there is no fun at all.
Losing the desire to live, death is the only end.
But these "nightmares" don't exist indefinitely. They also have natural enemies.
The natural enemy is called "dream hunter".
Dream hunters hunt nightmares that are about to get out of control, so that dreamers can alleviate some of the pressure from dreams and do not have to face life threats.
However, if the troubles are not resolved after the nightmare disappears, a new nightmare will appear and continue to suck your life.