Well, yes, but fact is: There's nothing happening in Agate right now. At least, based on what we've seen or heard.
So, it could be something related to spore/sleep powder. At the same time, Yawn is not too far off since it would be a way to make everyone sleepy, without causing any damages around Agate, and without people noticing it.
If it is Yawn, it could explain why you or Cain weren't affected, considering how loud T3RR4 is~
I'm just rambling though.