We have been told time and again that 8 hours of sleep is a must. However, for People who don't feel rested even after 8 hours of sleep. Excessive daytime sleepiness could be the reason of the poor quality of sleep at night.We must know that sleeping hours are far from being unproductive. It indeed decides how productive our waking hours would be. Sleeping is believed to regulate hormones that determine our feelings of fullness and hunger. So if you are sleep deprived, your body may stop sending these important signals to your brain, leading to weight gain.depression and irritability.When you sleep, your brain rests. When the brain rests, your heart rate comes down. Moreover, your memory gets reinforced during sleep. It turns off motor neurones in your spinal cord, leading to temporary paralysis, preventing you from acting upon your dreams. Sleeping is a meditative state where one renews his energies and rests when sleeping well as the yogi does in meditation.