Every night, I—like millions of others—put on a noise machine to help me sleep. Mine offers several types of noise: white, pink, green, and brown. I’ve noticed something strange, though. After about ...

Hannah Plunkett was a super frustrated mom. Her baby son had been crying on and off for ten hours, and nothing would soothe him. In a last-ditch effort at the “I’ll try anything” stage, Hannah put on ...