Do dragonflies live in the forest?

This morning 9-28-08, I was sitting out in the backyard with my coffee just as the sun was starting to lighten the sky and noticed the silhouette of a dragonfly on my yucca tree. I watched him for about 10 minutes wondering if he were sleeping or dead...he wasn't moving at all even though there was a nice breeze. I finally went in for my digital camera and got 3 shots of him before my cat shook the yucca tree chasing a lizard and he flew away. He definitely wasn't dead! From my observations, I believe dragonflies do sleep in trees.