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I found the open source repo for this extension, and someone else complained about the same thing here:

https://github.com/joelpt/sidewise/issues/82

From there, a kind developer forked the project, and fixed this issue for us, and more!

https://github.com/mcpower/sidewise

And if you're not comfortable using someone else's code, mcpower gave clear instructions on how to modify the existing sidewise code to fix the hibernation/wake issue.

Have fun!