Hello ...first of all good luck for your upcoming  exams.You need to relax a bit ,try doing the following  things it will help relax or you can go visit a psychiatrist  and talk it out. -try making a study plan (it will help you feel less pressure) -maintain sleep hygiene -take out at least 20 mins everyday to do things you like & enjoy while you do that -eat well,sleep well & pick some form of exercise to keep you going -avoid talking  to other friends  related  to how much they finished  studying Masturbation helps relieve  stress  & hence helps you sleep better. But anything  in excess  isn't good .