RINGGGGGGGGGGG!!

Yesterday night i hardcore study biology till around 2.30... Then i decided to go and sleep.. I set my alarm to 4.30am.. Later..when i woke up,its already 5.30am.. I was wondering how come my alarm didnt ring.. To my surprised.. the next day,my sister said tht it had rang for so long till the battery died off,cos she said it slowly loses its tone...so funny...newly bought alarm and a new set of battery just died off within 2 weeks,tht shows how much my alarm had been ringing without me hearing anything... sad case.. tht shows what a deep sleeper am i... =(