Its funny you mention this. I bought a new Oasis on Prime day to replace my original 2017 Oasis. Back in 2017 I complained about the battery. The battery on this new one is significantly better. I charged it full the day it arrived and I am still at 60% battery with at least some reading each day.
As for overnight drain...that really shouldn't happen at all unless it is indexing as others have said. Or stuck trying to download a book? You could try turing off wifi for a night and see what happens.
EDIT: Just noticed your statement above about turning off wifi.
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