To cry out, moan, or groan in one's sleep (typically because of a nightmare or distressing dream).
昨夜は悪い夢にうなされて、何度も目が覚めた。
Last night I cried out in my sleep from a bad dream and woke up several times.
彼は試験のことを考えてうなされていたらしく、朝までぐっすり眠れなかった。
He seemed to be moaning in his sleep about the exam and couldn't sleep well until morning.
赤ちゃんが夜中にうなされると、親はすぐに様子を見に行く。
When a baby cries out in its sleep at night, parents immediately go to check on it.