Something must have frighetend your son to have started this intense fear. Perhaps he heard something at school or more likely he saw something on TV which has frightened him. This is a passing phase but your son needs lots of patience and support now. If he has a nightmare go to him and reassure him. Put a nightlight in his room. Before he goes to sleep at night read happy stories to him such as Winnie the Pooh. If his fears persist he will need to see a child psychologist.
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