I will use my magical power to make him turn into a pig (no offense!) whenever he falls asleep so that he will not dare to fall asleep during work again.
I will also use my magical power to cast a Question-Mark spell on him.
This spell will make a Question-Mark appear above his head whenever he said that he understands whatever I briefed him when in fact he does not understand at all.
And last but not least, since now I have to do most of his work and had to monitor him all the time which adds to my already heavy workload, I will use my magical power to turn his paycheck into my paycheck. WAHAHAHA!!