Firstly, i'm less strict with myself. I watch movies during lunch and dinner. Sometimes I study until late at night, but not too late and still I can focus in class. Alhamdulillah. Dr Ruzana said it's got something to do with giving my limbic part of the brain its 'nutrition'. The limbic part is where emotions happen. So when it is happy, the rest of the brain can function better too...
Hope i'll continue to live my life..:D