The Kedushas Levi tells a mashal of a king who opens his treasuries for one day and allows all citizens to come and take whatever they desire.  Someone who sleeps on that day is a fool. He could have earned so much but squandered the opportunity.

Purim is approaching. We can acquire so much on this day – ruchniyos and gashmiyos, all our heart’s desires. The wise take advantage of this day, but the fools let the day pass unproductively. ~ R’ Elimelech Biderman