how exactly are the chucklevoodoos associated with sopor and sleep?

Chucklevoodoo has many applications, one of which is to give its victim terrible, violent nightmares. The sopor slime protect the young trolls from being victims of the spooky power. Since sopor slime is a light green it’s been theorized that one of the reason the Lime-blood trolls were hunted to extinction was that they held a natural immunity to chucklevoodoos or had a way to combat it.