Our expert says:
He is probably just having a bad dream, but is not remembering it.
If you hear him crying, wake him to interrupt the unpleasant experience, and then let him go back to sleep. He will almost certainly not remember it, but that will allow him hopefully to resume some more pleasant dream.
It really is not of medical importance, and it seems he is not even aware of it. He will grow out of it in time.
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