[True Self God] could modify the dreamer's skills related to target range or the number of targets, where the number naturally refers to how many, but the range does not work that way.
For example, if the original skill description was "creature," ["True Self God"] could change it to "Paranormal Creatures" or "player," but could not switch it to "non-creature."
Both Paranormal Creatures and players are classified as creatures, so this is a legitimate narrowing within the rules.
An idea occurred to the Illusion Dream Master to change the "creature" in [Seal of Slumber] to "player," but he hesitated.
Since all characters on the field, including the Zes and the Writer's characters, were considered "players," modifying it this way would ensure that many characters on the field would become sleepers the next time [Seal of Slumber] was triggered.
From the perspective of numbers, it seemed to affect his side more...
Forget it, why bother?
Change it, I'm going to change it!