I got a random event. Saying this Whoa, what was that!? You could swear something rushed at you, but there’s nothing around. Suddenly, you feel very tired.

We don't know what it means yet, but speculation is that it's related to an upcoming plot. The event should gradually make your avatar look a bit gray-ish.

Seems to take a while though. Got the event more than twelve hours ago and haven't faded yet.