Leaders need to serve themselves. This is the leadership hack of Barbara Humpton, CEO of Siemens in the United States. While leaders need to serve their leaders, their customers, their partners, and their teams, they also need to serve themselves. Self-care can manifest in a lot of different ways, but for Barbara, it's about sleep. Oftentimes, sleeping on a problem can greatly increase your potential for better ideas instead of trying to solve the problem at the moment. Self-care is different for each person, as each of us is dealing with different kinds of stress. But the most important thing is that you take care of yourself so that you can then take care of others.