夢でも

even a dream

→ 夢
phrase Rare #45,105
even a dream でも can emphasize that something is included despite being unlikely or insufficient; in some contexts, it can mean “or something.”
JA: 夢でもいいから、世界中を旅したい。
EN: Even if it’s only a dream, I want to travel around the world.

悪い夢でも見たの?

Did you have a bad dream?

— 箪笥<たんす> (2003)

そんな…夢でも見たんじゃないの

Come on… you must’ve been dreaming.

— PERFECT BLUE (1998)

夢でも見てたんだろう

You must have been dreaming.

— オープン・ユア・アイズ (1997)

悪い夢でも見てたみたいだ

It seems like I was having a bad dream.

— Demon Slayer -Kimetsu no Yaiba- The Movie: Mugen Train (2020)