climb yosemite s el captain without help to the top. this is the first time it s happened. for a day off, napping in a tent hanging off higher than the empire state building. definitely not a safe job for the sleepwalker. jeanne moos has more. reporter: don t look down don t look up. you are looking at climbers who have fallen. something called the don wall on the vertical rock formation el captain at yosemite national park. yesterday was day eight. reporter: it s easy to lose track of time when you re climbing a wall using your hands and feet finding min in thisuscule ledges using hopes not to climb but to catch you when you fall. after several years after planning and training tommy caldwell and kevin jorgson, they do their dreaming on the wall