For night mode - triple click on the home button, aagstn. If the triple click on the home button doesn't work, go to settings / general /accessibility / Triple-click Home should be set to White/Black.
This turns your whole iPad into Night Mode, but it's better than none. There are annoying backlit bar in iBooks.
I'd love it if they set up their bookshelf "collections" to be sortable. At least I can group my authors by name now.
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