I picked up my iPad after 3 days of inaction and it was down to 55% battery. Odd, I thought, perhaps I beat it up at the weekend and the battery got low. Plugged it in and charged it up to 100%, hit the sleepy switch on the top. 24 hours later its at 80%. It's done nothing unless elves have been playing youtube vids on it whilst I'm at work, it's really sat in the same spot asleep waiting for me to find something fun to try. What's it doing with all that battery power? I can leave my iPhone out 4 days and it's still charged and that has a battery the size of .. well the size of an iPhone. Do all iPads eat power when asleep?