noun
lingering dream; unfinished dream
A dream that remains in one's mind after waking, or a dream that was interrupted and feels incomplete. Somewhat literary and not an everyday word.
朝起きても、残夢が頭から離れなかった。
Even after waking up in the morning, the lingering dream wouldn't leave my mind.
目覚ましで起こされて、残夢のような気分だった。
I was woken by the alarm and felt as if I were in an unfinished dream.