"I dreamed I was on a boat and it was rocking really badly," said 10-year-old Mykal Fold.
Shyan Andrews 10, said she felt her bed rocking and heard the windows rattling.
Some pupils said the electricity had gone off at their homes while others said things had fallen from shelves and cupboards.
Keith St principal Linda Ireton said the school's phone system was down yesterday although she had been able to confirm that most of the children were absent because they were tired and anxious after the early morning earthquake.
"We have been doing drills today to help reassure the children who are at school and writing and talking about their experiences has been really helpful too."
Other schools in Whanganui also reported a few absences and Tawhero School principal Chris Dibben said parents had sent text messages to say that their children had been awake after the earthquake and needed sleep.
"We do regular drills at school and it was good to hear the children who were at school saying they remembered what to do in an earthquake," he said.