battery gone flat

battery really gone flat.. real flat..
it cant last me till finals..
everyday seems like 24 hours of staying up without any sleep
every morning dont feel like waking up..
n feel like sleeping right after waking up~
even if i've got my 8 hours of sleep on average everyday..
gg....!!! how weak has my body turn into~!!
REASON: LAZY!!! NO EXERCISE!!!
ouch~