Insufficient sleep can negatively affect the heart, lungs and kidneys; appetite, metabolism, and weight control, reports Entrepreneur.

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?