GMA 40: Watch the 40-Hour Sleepless Saga of ABC News' Dan Childs

Learn what no sleep can do to the body.

Dan Childs, the head of ABC News' Medical Unit, has volunteered to show exactly how your body and mind are affected by sleep deprivation and why getting some shut-eye is key to a healthy lifestyle.

To show how important sleep is, Dan Childs is doing just the opposite and staying awake so that he can interview experts, play memory games and even try out an "Operation" to show how no sleep can quickly take a toll on the body.