Great businesses are built on huge amounts of energy. Even more important than huge amounts of funding.
You can burn the candle at both ends for a while, but there comes a point where you get diminishing returns.
You job is to lead. Your job is to make decisions. Your job is to be a bundle of energy and enthusiasm.
It may sound boring, but if you are going to give your company its best chance of success, you need to get the amount of sleep that your body requires. There is no badge of honour for who is the most tired.