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I was going to say that modern phones don't have the resources to perform recognition/recording outside of a trigger phrase without an obvious hit to battery life. But then there is the Pixel 2 which can identify a few thousand songs with little performance impact. All of the wired assistants don't even have this issue.

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I use Sleep Cycle for my alarm clock, which uses the microphone to listen to your sleep and wake you up when it's a good time and you're ready for it. My bedside charging cable has been malfunctioning the past few days, so my phone has been running off the battery all night while doing this. Despite this, my battery only drops a small amount between when I turn the alarm on and when I wake up.

If the app was designed correctly it would probably only be listening within a ~1 hour window of when you want to wake up

That would be smart if it was just an alarm, but it also presents a full analysis of the entire night’s sleep, and notes and records any snoring it detects.

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