Well, a few years before the West Ridge I did the Jeep way with my dog late in the afternoon. By the time we got to the top it was too late to come back down without a flashlight. Yes, I know, I shouldn't have done a lot of things so many things dreadfully wrong. But, we, my dog and I ended up sleeping on top hugging each other and shivering all night. I had a fiber-fill jacket and my dog had her fur. Our half a bottle of water froze overnight despite my thinking that it felt cold only because it was windy. One of the most miserable bivys of my life. My poor dog stayed with me all night.