Daydream? Stoning?

Wondering whats happening to me recently... left me alone for awhile and i'll be off staring blindly at some corner. You can call it daydreaming or stoning, its just being lost in thoughts. Quite lost really. Maybe i need some activities in addition to my standard lesson n practises weekly. Just hope i could be more enthu abt things happening around me after i finish my exams for special sem. Else i dont even know the reason in me doing what i'm doing now...