what are they dreaming of vs what are they dreaming about

Some examples from the web:

• I'm dreaming of dandelion salad.
• Dreaming of me was like dreaming of a spirit head.
• Look at him, dreaming of past glories, no doubt.
• Maybe it's time you started dreaming of someone else.
• I wasn't like other kids, dreaming of being an astronaut.
• Dreaming of a husband, praying I'd turn out pretty.
• I was dreaming of someone much more romantic.
• I think I'm finally done dreaming of Killian.
• You still dreaming of barbarian lands?
• Lovers, dreaming of a future together.
• Never stop dreaming of a better tomorrow.
• I know the dream that you're dreaming of.
• It must be dreaming of flying in the sky.
• I've been dreaming of this moment for like years.
• Whatever it is you're dreaming of, build it.
• It's everything I've been dreaming of, so...
• Revolutions waiting to happen, dreaming of changing the world.
• And if we're human, we immediately start dreaming of something else.
• Deep inside you're dreaming of...
• One more lost soul, dreaming of Utopia.

Some examples from the web:

• I mean, dreaming about this exactly.
• There's nothing else worth dreaming about.
• I've been dreaming about surfing all night.
• I think she might be dreaming about that Toomy guy.
• You're dreaming about the provinces that were promised to us.
• I was dreaming about how awful those sausage rolls were last night.
• I have been dreaming about this moment for months.
• I've been dreaming about it for five years.
• Mr. Mackey must be dreaming about something extremely traumatic.
• Maybe you should dreaming about someone else.
• I have been dreaming about this merger all week long.
• We've been dreaming about this for 16 years.
• He's dreaming about... a world without any weeds.
• Well, maybe he's dreaming about you.
• Me, all night, dreaming about Angela's smoking hot body.
• Mitch - he's dreaming about the sea.
• He's dreaming about his favorite things.
• I'm dreaming about that chocolate cake.
• I wasn't just dreaming about being with you, Norma.
• V.O.: Tryto rememberwhatareyou dreaming about in the new place.