The Nightmare World had parasitized the Sorcerers World. Therefore, it also had the law of day and night.
Night was a blur of distant surroundings, shrouded in nightmare mists, a stressful situation of not being able to see a thing. Every bed a person could sleep on was the entrance to the Sorcerers World.
In other words, this was the place where the mental state of men from the Sorcerers World could be lost and enter into the Nightmare World.
As day arrived, all world aperture gateways between the Sorcerers World and the Nightmare World had seemingly closed. The blurry shrouds of mist in the distance had also dispersed. However, the world seemed as if it had become a half-illusioned body, a body similar to Grimm's when he had become a half-illusioned body at night.
A black sun was hanging high up in the sky.