I was thinking the same thing.
In the creating a race section it says this:
Dreamspeaker (2 RP): Prerequisites: None; Benefit:
Members of this race gain a +1 bonus to the saving
throw DCs of spells of the divination school and spells
that produce sleep effects that they cast. In addition,
members of this race with a Charisma score of 15 or
higher may use dream once per day as a spell-like ability
(caster level is equal to the user’s character level).
It seems like it's spells only. But look I am not sure how it carries over to supernatural abilities.