First of all, you need to have automatic brightness turned off. I also have it turned off in the system settings because it's so annoying, fluctuating all the time depending how you turn the tablet. Frankly, I've had brightness change least of all in Aldiko compared to Overdrive or the native Kobo reader app. But reading ourrealm's post above, I now see why it would sometimes change when I inadvertently touched the screen. That's a neat way to adjust the brightness in one step. When I'm reading as dusk approaches, I have to step down the brightness several times before switching to night mode.
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