Night terrors are very common for young children.

It is quite frustrating when you can't communicate. My lil' Nate had night terrors for at least 6 months before he could express what was going on. Although it's normal, I still wondered and worried. Definitely keep an eye on it. I wouldn't be too concerned unless you noticed a change in his behavior during the day as well.

My son no longer has night terrors but he sure does talk a lot in his sleep at night.