From The Atlantic Magazine

For a few days this summer, Alexa, the voice assistant who speaks to me through my Amazon Echo Dot, took to ending our interactions with a whisper: Sweet dreams. Every time it happened, I was startled, although I thought I understood why she was doing it, insofar as I understand anything that goes on inside that squat slice of black tube.  I had gone onto Amazon.com and activated a third-party “skill”—an applike program that enables Alexa to perform a service or do a trick—called “Baby Lullaby.”