The commanding officer of the science vessel USS Brattain, found dead with almost all her crew after the ship was trapped in a Tyken's Rift in Night Terrors.
Captain Chantal Zaheva commanded the USS Brattain, a Miranda-class science ship. She is seen dead and in log recordings in the fourth-season episode Night Terrors.
The Enterprise finds the Brattain adrift in a binary system with thirty-four bodies aboard, all dead by violence, and a single catatonic survivor, the Betazoid Andrus Hagan. Zaheva's logs show her growing irrational and suspicious, convinced her officers were plotting against her.
The cause was dream deprivation. Aliens caught on the other side of the rift were trying to communicate telepathically and unintentionally blocking the humans' REM sleep. The Enterprise crew begin to follow the same path before Troi and Data find the answer.