Dream Recorder

This is an idea of s technological object that not exist but I want to have it:

The device I want is a Dream Recorder.
It is a small machine you wear on your head when you sleep.
It can record your dreams and show them like a movie when you wake up.

How does it work?
It reads your brain while you sleep.
Then, it uses a computer to make a video of your dream.
You can watch your dream on your phone or TV the next day.

I think it would be fun and interesting.
Sometimes we forget dreams, but with this, we can remember them.