I couldnt concentrate on my studies today- 23/7/09

I duno why...i don't know what is wrong with me today. I couldn't concentrate on my studies at all. I read the whole sentence and i was like' what '? and i keep repeating the same sentence for few times but yet i couldn't get these things in my mind. Something wrong with me today . Probably im exhausted, mind stress. I don't know what to do. Perhaps i should take some rest, and get myself into good condition, so i could concentrate again. Ah~!!!, nvm lahx, i continue tmrw, damn wasted like 2hours ...T_T