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What is the electrical state of the GPIO pins when the module is sleeping? Are they high-Z or ground?

I have an external component that I want to put into its sleep mode by pulling it's *SLEEP input to ground. If I use digitalWrite to set a pin low and then put the Z-Uno module to sleep what happens to that output pin?

As I remember, they remain same as before sleep mode. So make sure not to drain the battery!