Whenever I need to walk away I just tap the top button, not exit out of the book. This puts it to sleep. I wake it up, unlock the screen and it's still in the book.
For a moment or more a quick few seconds of unlocking doesn't add that much more hassle if you were away for a minute or two or more.
Unless you have the sleep of death issue, I'd just say tap the top button and when it unlocks you'll still be in the book.
|