The latest scientific study has revealed that sleeping less than 6 years constantly can lead of passive gene activities. This passive gene activities directly effects the immune system, metabolism and the body's response to stress getting. Tests on people who slept less than six hours a night for a week revealed substantial changes in the activity of genes that govern the immune system, metabolism, sleep and wake cycles, and the body's response to stress. Constant less sleep can lead to heart disease, diabetes, obesity, stress and depression. The interesting fact for us is that there is very minor difference in sleep duration which leads to these kinds of problems.