Alarm clock dosn´t work if smartphone is off?

My FP2 works well, but only the alarm don´t wake up when it´s switched off, if it´s on it works.
Are there any ideas so solve the problem?
Thanks

Regain your privacy! Adopt /e/ the unGoogled mobile OS and online servicesphone

This is a feature that only the FP1 (and FP1U) had. It’s technically impossible in the FP2 (and FP3 and certainly FP4, too).

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Leave the phone on and put it into airplane mode at night.

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That is your reason to switch off the device?