HAVE A DREAM 夢を見る

To have an experience in your mind while you sleep is to have a dream.

Be Careful! You do not “SEE a dream” like the Japanese 夢を見る. You HAVE a dream.
have a dream は、眠っている間に物事を体験しているかのように感じる、つまり、夢を見る、という意味です。

注意：日本語では、夢を「見る」と言いますが、英語では see は使わず、HAVE a dream と言います。

I have the same dream every night. I'm trying to run away from something, but I can't move.
I had a strange dream about you the other night.
I had a dream last night that I was flying on the back of a dragon over the Himalayas.
(to a child screaming from her bed)
What's wrong, honey? Did you have a bad dream?
Why did you wake me up? I was having the nicest dream!