Sleep is essential to your survival as a human being. In fact, it’s likely that you can survive longer without food than you can without sleep. The exact reason you need to sleep eludes scientists, but they do know that sleep is restorative. It supports brain function, conserves your energy, and is rejuvenating in general. You can feel its restorative effects after you’ve had a really good night’s sleep–and the lack of those effects after a couple of nights of tossing and turning without adequate . . . ? read more..