K.L.
They can happen anytime the child is asleep. Our son had them when he was sick and his fever broke. We did find they only happened when we gave him liquid tylenol. The Dr thought maybe he had a slight allergy to it and we switched to a different fever reducer and never saw another night terror. They sure are a strange thing to go thru.. Our son would wake up screaming, thrashing and begging for mommy, but I was right there trying to hold him and he acted as if he couldn't see me and was pushing me away as if I was a stranger trying to hurt him. He would then get up and go to the light switch and flip the switch up and down and then with this horrible scary face would look at the light and scream that it was going on and off !.. It was true terror to watch him. I was so glad when that was over and done. And then he would be calm and "wake up" for real, and be glad to see me and had no idea what he had just done! But yes, even in the daytime.