My 6 year old is waking up with these odd terror attacks

In the past few months, my son has woken up in these odd states of hysteria. He’s done it twice in a close amount of time.He will get up and seems coherent, but he’s just panicking and whimpering. It’s like the lights are on but no one’s home, for the lack of a better phrase.The first time hearing my voice over my wife’s sort of knocked him out of it. Tonight it was a bit worse. I had to take him downstairs and sit him on the couch and talk to him. It sort of broke the fit, but he still seemed out of it.Any suggestions? The frequency of it was concerning. Alternate strategy? via /r/Parenting http://ift.tt/2mUMFhj