Holy Kings

This is the day Christians celebrate the three holy men, often refered to as kings, who came from the east to baby Jesus with gifts. They predicted He would be a great king. They also gave him gifts. It has been said these gifts are the original inspiration for Christmas presents. If this is the case, I wonder why Christmas presents are exchanged much earlier, on Christmas Eve or in some countries on Christmas Day. Is it just that people are impatient and do not want to wait? I ave not heard any other explanation. Perhaps there is an explanation, I might have to look further into this.