How do I set up automatic temperature control when I'm away or asleep?
You can set up Automatic Actions in the Alexa app to manage your temperature automatically when Alexa has a hunch you're asleep or away. Open the Alexa app, go to Devices > Thermostat > Settings > Alexa automatic control, and switch on Set sleep temperature or Set away temperature.
From the official Amazon Smart Thermostat manual, page 11
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