Our brain depends on proper hydration to work optimally. The brain cells require a right balance between water and other elements and when you lose too much water, the brain loses its efficiency. The ability to perform mental arithmetic, like making guesses and calculations are comprised when fluids are low. We typically take fluids in every half hour but the longest gap where you don’t get take any fluids is when we sleep. With every breath, we expel moisture, and the cumulative effect of night’s sleep is to dry out. Studies have also shown that dehydration can also cause shrinking of brain, declining of memory and difficulty in thinking. Therefore drinking water is not all about quenching thirst. Try making a habit of drinking wherever you go because it gives you access of the whole functioning of your body.