What will happen if you don't sleep for a week?

Won't function: You will not function - it will be worse than if you were drunk. Your motor skills, reaction time, coordination, thinking, memory, vision will all be affected. Your health (metabolic, nutritional, and immune systems) will all be negatively affected. You're more likely to get sick, gain weight, suffer a heart attack, and have psychiatric problems including hallucinations. Sleep is required.