My Dad had a Samsung phone with a "fully charged, unplug me" message and tone that couldn't be turned off. To make matters worse, if he ignored it and went back to sleep it would reach the threshold and pathologically start charging again ~2-3 hours later. He said "it whimpers all through the night" and could only charge it when he was awake to save his sanity.

I had a different situation, I sleep with roaring fans near my head and had to turn the phone alarm way up to hear it reliably. Then it would wake the neighbor at 430am whether it woke me or not. I purchased a separate 24hr timer and set the fans to go off at 4:25am, leaving a quiet room. And a quieter alarm always wakes me. Though I am now conditioned to hear when the fans shut off and get out of bed, and hardly ever fail to turn the alarm off in time.