> a sleep-tracking device that can alter dreams by tracking hypnagogia and then delivering audio cues based on incoming physiological data, at precise times in the sleep cycle, to make dream direction possible.
add small electrical impulses upon the muscles (electronic massager style) and you will feel running. Add temperature changing clothes/blankets - and you're running away from a polar bear... Especially if to add a smell of the bear.
Inception via smart speaker.