Another Joke of the Century - Alarm Clock Duty

I was on overnight shift work yesterday. Despite it was a rather relax sunday work, I was still quite tired. After all the essential works I had completed, I understand that I can wake up late in the morning.

However, it wasnt what as I thought as I was waken by the alarm clock set by another colleague who sleeps directly above mi. I got out of bed and then return to sleep when I realised it wasnt my time for the shift work. While my colleague saw mi got out of bed, he thought he had set wrong timing and thus, return to sleep.

What a confusion situation at such late hour, think it was 0510 hrs.