Sometimes when I wake up in the middle of a anxiety dream I grab a soft blanket and wrap it around me and lie on the floor with my legs up on the bed. And I lie there and breathe. It lets your back really flatten out and stretch and helps me feel attached to the ground. Sometimes I literally also touch the bark of one of the gum trees on the way to the train station after a particularly bad night. YMMV so just putting it out there. Anxiety dreams SUCK especially when you wake up in the middle before your brain has finished filing whatever it is its trying to file. Go gently today.