For as long as I known, entrepreneurship has been associated with working ridiculously long hours during the day, often followed by sleepless nights, in a bid to grow a business, or to at least keep it afloat.

Related: 6 Sleep Habits and Early Morning Rituals of World Cup Champion Alex Morgan

Lots of entrepreneurs get trapped in that unhealthy cycle. In fact, it took Arianna Huffington's collapse from exhaustion in her office, during which she broke her cheekbone, to prompt that media mogul to start extolling the virtues of a balanced life.

As someone used to pulling all-nighters working, it was often a struggle to leave my work for even just a couple of hours of quality sleep. But then the thought hit me: Why do the successful entrepreneurs I admire the most all put so much emphasis on a good bedtime routine and the importance of seven to nine hours of uninterrupted sleep?