These women may run major companies, but their bodies don't know that. In fact, none of ours do. It is a machine that works in the same way that every other human's does, give or take a few things. Subject them to lack of sleep, too much stress and they will respond in exactly the same way: breakdown.
We rely on our beloved rectangles for everything from telling time to finding out what's happening in our friends' lives, from Googling where we're going to eat to unlocking the mysteries of GPS by telling us which street we're walking down. But the problem is that our smartphones are not going to say: 'Hey, you've been stalking that person on Instagram for half an hour - don't you think it's time to sleep?'