I listen to ambient nature noise (thunderstorms are a favorite) with noise-canceling headphones while laying in bed.
Still technically electronics, but it doesn't require any active attention, so it does a great job at transitioning my brain to a state where falling asleep is easy, while still being stimulated enough in the meantime to avoid being restless/bored.
Black bears are pretty skittish, so usually acting big & loud is enough to make them jog away, but I'm not sure someone could take them in a fight if the black bear was cornered.
Speaking of which, bears are extremely protective of their cubs, so if you ever see any cubs, running away from them at full speed is probably the best choice.