still remember one guy during my uni days...
he was a part-time student.. working full-time but studying for
his degree...
he ran out of coffee, so he stole some of his boss's..
promptly did a faceplant at around 3pm coz he didn't know it was
decaf 
i dunno if it's the caffinaine tat keeps me alert... I kinda tot it
just became a habit since i can go right to bed after finishing a
cup of kopiO at the kopitiam...