Xin Yi is 'sick'...she's tired but the number of hours she spend sleeping is getting lesser...at night,she can go to bed at around 1am and still have difficulty sleeping...in the morning, she wakes up automatically even before the alarm clock starts to beep...thinking that she's stressed? apparently, she's not...she does not feel stressed at all cuz she haven start her revision yet...so why is she having such weird symptons? the reason lies in 1642...decode that if you're interested and you'll get the ans...=)