If you awoke this morning feeling a little more tired than usual, you might have glanced at your FitBit to see how many REM sleep cycles you clocked last night. Perhaps you then stumbled into the kitchen to grab an espresso (brewed fresh while you were getting dressed, thanks to a nifty app on your phone). And as you do, your smart fridge announces that you’re running out of milk, so you tell Alexa to add it to the weekly shopping list.