Have only installed a few apps so far. I've observed that in the list of tablet functions effected by the app "prevents sleep function" is stated. Does this really mean I can't put the tablet to sleep; or that it may wake the tablet for some action on occasion; or..... What does it do to battery conservation? I've avoided these apps so far, as on most of them I can see no reason the sleep function would play any part in app functionality. I've also noticed that many of the Marketplace apps are very, and unnecessarily, privacy intrusive. Perhaps to be expected for free apps, but if you pay for them?????