Hello Friend, Good that you are seeking a help here. Over sleeping is a symptoms of emotional disturbance in mind. It may be a sign of depression. Be positive. Take a professional counselling help to openly discuss what's happening around your life in the recent times like changes in lifestyle, career or studies related stress, relationships issues, food habits,  excersise patterns etc. Any of these could easily trigger anxious thoughts that could be reason for your depression and weight gain. Feel free to reach out to me online through Practo app for further detailed evaluation and suitable recommendation. Be positive. You will be alright soon.