Hi, I think because you r not able to concentrate on studies you are over eating unknowingly hence you are not able to sleep properly. Since how long u feel you are not able to concentrate. R u comparing yourself with others or u r not able to match your own standard. Think.... Also hv a session with a counsellor and come of that vicious circle.

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Inculcate healthy habits. Sometimes minor lifestyle changes do wonders. Eat healthy, balanced diet. small meals at frequent intervals with regular exercise 20-30 minutes daily, 5 days a week is enough to keep you fit. Exercise also releases endorphins in your brain which have a mood elevating effect. Also practice good sleeping habits. Search 'sleep hygeine' on google and start following it. You will notice a change in you once you begin doing all this.