I used to read the Archie comics long, long ago. One of my favorite stories centered around an alternate universe where the characters could go to a place similar to a Blockbuster’s (remember those?) and simply order the thing they wanted to dream about. Afterwards, they could re-watch and re-enjoy those dreams again.
I always loved that so much because I have been constantly fascinated by the idea of lucid dreaming. I think people go into alternate universes and realities when they dream, therefore anything is realistically possible in the mind.
Choosing what to dream about is hard business, as well as remembering your dreams as they happened.
The only downside would be that I would never want to stop replaying the dreams! It would be addicting.
But if I could have any futuristic gadget for a day, it would be something that would do just that.