Calm app’s ‘Sleep Stories’ are written by the ‘JK Rowling of slow literature’ Phoebe Smith, who highlights soothing, sensory adventures in places like Provence and NepalRead MarketWatch https://www.marketwatch.com/story/meet-the-woman-who-tells-bedtime-stories-to-adults-to-put-them-to-sleep-2018-12-17Getty Images