Every week it seems like there's a new piece of advice for would-be entrepreneurs from the ones who've already made their mark on the world. Tim Cook starts sending emails at 4:30 in the morning. Steve Jobs once ate nothing but carrots. Donald Trump supposedly sleeps only four hours a night. Most recently, serial odd-advice-giver Gary Vaynerchuck has told Business Insider that he doesn't eat in the daytime. But do you really need these weird habits to be an entrepreneur?