H.C.
My son also did this at about a year and it lasted almost 6 months, but it was off and on. We would have one or two good weeks and then several bad nights in a row. I thought it might be "growing pains", but the doctor told me that children that young do not feel pain like young adolesence. But it could be rapid growth spurts that cause them to wake up. The terror part and not being able to console them, well no one could ever help me with that part. Most of the time my son would get extremely angry and push us away, but we would persist and make sure he was actually awake. Sometimes he would stare directly at the same corner of his bedroom, like he was in a trance. I'm not the most religeous person in the world, but I was praying and asking God to protect him because this was really scary for my husband and I. I finally got every cross in the house and put it up in his bedroom (my necklaces, pendants, etc.) The very next night after I did that was the last time he had the terrors. SO, I don't know for sure what it was, but I know that it stopped after I asked God to take away whatever was doing this to him. Some people may think that's crazy, I just know that it stopped and that was the most important thing to me.