The brain uses significantly less energy during sleep than it does when awake. During sleep the body is not in a state to respond to the stimuli quickly or even perceive it. While sleeping most of the body’s systems are in a repair mode, helping to restore the immune, nervous, skeletal, and muscular systems.
Studies show that every hour of sleep deprivation below 8 hours for adults results in a 25% loss in productivity. Six hours of sleep or less lowers our resistance to viral infections by 50%. Six hours of continuous sleep is more restorative than eight hours of interrupted sleep.