Coffee is well known for shunning sleep. But mind you, consuming coffee in hours of sleep or fatigue is dangerous. It causes a dizzy effect and sleeplessness. Coffee also disturbs the natural cycle of sleep and repeatedly using it for keeping sleep away, can in long run lead to Insomnia. In case of people who suffer from Insomnia, consumption of caffeine is not at all recommended, because it aggravates the disease. In cases where coffee is drunk to push sleep off, drinking water is recommended, though in excess quantities as it stabilizes the metabolism and creates a harmony in the body.