Why should start CEOs pay attention to their mental health?
It is easy to burn out no matter how successful you are. You might accept unhappiness in the present, thinking the next milestone or the round of funding will make you happy, but the problem is that that's not a sustainable strategy for actually achieving happiness, and if you're not happy, you will not want to do what you're doing for an extended period of time.
As a CEO of a startup, you are a very important component and if you burn out, you are not doing yourself or your investors, employees or customers any favors, so you need to retain yourself. You need to create a situation inside your company where you are going to be available for a long time. Taking care of yourself is actually your obligation.