 Am I awake or asleep? Really taking a moment to consider your surroundings and think, you know, just does it feel like I'm in a dream? Is there any evidence that things are shaky? And actually do something like, you know, you might pinch your nostrils and see if you can still breathe. And if you can't breathe, then you know you're awake. That's what lucid dreaming researchers call a reality test.