Getting into iit through JEE appears to be a nightmare for the candidates who are aspiring to get into iits. most of the time the students will be under pressure and stress, so they will not eat and sleep properly. few of them will continuously be sitting with books without food and sleep. one has to be crazy for the competitive exams like JEE but proper sleep and managing day is also important. brain also need proper rest in the form of sleep to grasp more. so it’s important to be healthy. hence 6-7 hours sleep is required.