In the movie, the dream-snatchers use a drug called somnacin and a dream machine to upload a scenario into someone's sleeping mind. One or more of them then go to sleep themselves, hooked up to the machine, and enter the target's dream.
This fictional dream machine is called a Portable Automated Somnacin IntraVenous (PASIV) Device.
A device does already exist that can effectively read someone's mind. A functional MRI scanner takes snapshots of brain activity, and then the software recreates images of what the subject was looking at.
The researchers say it has the potential one day be able to record someone's dream - without the mess and danger (or the fun) of actually sharing that dream."
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