Will lack of sleep cause a person to lose temper?

Of course: Sleep is something to do with energy regeneration. Mild loss of energy in the limbic system of the brain causes it to become irritable. Since that part of the brain initiates our emotions they beome more easily evoked and exaggerated. High calorie malnutrition will do the same. I see it all the time, particularly in kids and i think that it is the cause of much troublre in our culture.