The first way is easy to do is to drink a glass of water and do moderate exercise. Wash your face with water can also quickly eliminate sleepiness.
If you're working, you should first leave your job for a moment, looking away for a moment and try to walk around just to relax the body and legs.
In addition, you can drink coffee, but for some people is more efficacious when compared with drinking tea drink coffee to relieve sleepiness.
Another tip is to try to eliminate sleepiness avoid eating meat when your lunch. The body and the stomach requires extra energy to digest and process the meat, which cause you to be fast asleep. The latter try to sleep and adequate rest at night, at least 8 hours a day.
Source: http://tips-tips-ampuh.blogspot.com/2012/05/tips-ampuh-menghilangkan-ngantuk.html