> Another person on Perenson's blog wrote: “I had my iPhone under my pillow playing music through the headphones for a nap, I awoke with a sharp pain on my left

> Another person on Perenson's blog wrote: “I had my iPhone under my pillow playing music through the headphones for a nap, I awoke with a sharp pain on my left arm under the pillow. I had been burned from the iPhone getting so hot." This might be part of the problem. User behavior does matter.