The Sleepwalkers Today, on a Sunday, I only wanted to buy a few yogurts. Instead, I found myself watching a small experiment in human nature. A few weeks ago, the first 24-hour Migros supermarket in Switzerland opened in my village. There are no cashiers, no staff standing around to help. You scan your loyalty card or a QR code to enter, pick up your groceries, pay at the self-checkout, and leave.…