Originally Posted by SirBC
Well, not really. But the brighter LCD of the iPad compared to the Kindle can decrease the the ability of the body to produce melatonin which is an important compound in helping you fall asleep. Hence, why Jobs looks so sleep deprived.
He is sleep deprived because he is thinking of more nasty stabs he can take at Adobe. Probably an OSX upgrade that disables flash and no more shiny Apple products for any Acrobat Reader users.