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I woke up to the sound of rustling tree branches.
I was awaken by the sound of rustling tree branches.

What's the difference?
Thanks.
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I woke up to the sound of rustling tree branches. I woke up and heard - the rustling wasn't necessarily the cause of my waking.

I was awakened by the sound of rustling tree branches. The rustling sounds caused me to wake up.
Comments  
Thanks, Optilang.