The Guatemalans stay up until midnight on the 24th of December and set off fireworks. At midnight they open presents and dance and celebrate (at least those who have extra money to buy them - Sam said in his area it is basically a regular day, no gifts, no special meals, nothing). As a result, on the 25th all are exhausted and everyone sleeps. In their nativity scenes they also hide the baby Jesus until midnight. When they welcome in the 25th at this hour, the baby is born and they put him in the manger.