Sarah is a burnout. Her 20s have been wasted in a psychedelic haze. Now she wants to be sober and avoid temptation, so she joins a clinical trial to be sequestered away from the world.
Paranoia flows. Weird experiments are carried out on the participants' waking and sleeping bodies. They realize the trial is changing them. Programming them. Installing false memories and removing emotions.
If they don't do something before their tenure ends, they might not be human when they leave.