Sleep while working

It's 3.30pm...and I'm almost dead for trying to open my eyes wide open.. I don't know why I'm soooo sleepy... Keep yawning for the 100 times, and eyes are getting smaller and smaller... Hope i won't fall asleep while doing my work (Telampau banyak keja today)... But I'm feeling myself drifting to sleeping mode.. In 10 minutes I'm sure I'm going to ZZzzZZzZzZZzZz!!! . . . . ZzZZzZzz...ZzzZzzz...Zzzzzzzz