In the past, sleep was often ignored by doctors and surrounded by myths. Now, though, we are beginning to understand the importance of sleep to overall health and well-being.

We've learned, for example, that when people get less than 6 to 7 hours of sleep each night, they are at a greater risk of developing diseases. All the more reason to get some sleep, right? Here are 10 reasons why you should call it an early night.