Is there any alarm clock embedded in me?

How many times u would have woken up before ur alarm clock starts ringing... I don't know about others, but I am waking up exactly 2-3 mins before my alarm starts shouting. I don't have any important appointment or I don't have any urgency to get up and rush to office. Its just a daily routine to keep an alarm. Now, I keep thinking.... is this any kind of disorder?. How many people would have been affected by this ???. The biggest twist adding to this confusion of mine is.... if i dont keep an alarm i dont wake up at the correct time....... :(