This sounds like a very common problem at this age called night terrors. The cause is usually not obvious.These night terrors start suddenly as you have described here. Your son will have no recollection of waking up and of the bad dream that he had. You have to be cautious about not starting another problem where your son will get into the habit of waking up with the aim of getting into your bed. You have to be firm. When he wakes up just go to him reassure him, tuck him up in his bed again, kiss him goodnight and leave his room. Do not allow him to come to your bed. Take him back to his bed each time if he wakes up more than once. A night light in his room may help.
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