ST:TNG:91 - "Night Terrors" (Stardate: 44631.2) - this is the 17th episode of the 4th season of Star Trek: The Next Generation.
When the Enterprise locates the Brattain, a science vessel that's adrift in space, the Enterprise discovers that everyone is dead except for their Betazoid counselor - and it turns out they killed each other! Soon, everyone begins exhibiting paranoia with the exception of Troi who has nightmares and Data who is an android. Dr. Crusher soon realizes that the root cause has something to do with REM sleep (Rapid Eye Movement) - which is the level of brain activity in which one dreams. But that's not all that's going on.
Can the Enterprise crew figure out what's happening before the same thing happens to them? Trivia note: Whoopi Goldberg stars again as Guinan. And Data suggests using a technique used against the Borg in "The Best Of Both Worlds".
When the Enterprise locates the Brattain, a science vessel that's adrift in space, the Enterprise discovers that everyone is dead except for their Betazoid counselor - and it turns out they killed each other! Soon, everyone begins exhibiting paranoia with the exception of Troi who has nightmares and Data who is an android. Dr. Crusher soon realizes that the root cause has something to do with REM sleep (Rapid Eye Movement) - which is the level of brain activity in which one dreams. But that's not all that's going on.
Can the Enterprise crew figure out what's happening before the same thing happens to them? Trivia note: Whoopi Goldberg stars again as Guinan. And Data suggests using a technique used against the Borg in "The Best Of Both Worlds".