17 user 6 critic
Commander Riker's inability to fall asleep begins to show in other members of the crew in other forms, putting the Enterprise on the trail of a mystery.


Robert Wiemer


Gene Roddenberry (created by), Brannon Braga (teleplay by) | 4 more credits »




Episode complete credited cast:
Patrick Stewart ... Capt. Jean-Luc Picard
Jonathan Frakes ... Cmdr. William Riker
LeVar Burton ... Lt. Cmdr. Geordi La Forge
Michael Dorn ... Lt. Worf
Gates McFadden ... Dr. Beverly Crusher
Marina Sirtis ... Counselor Deanna Troi
Brent Spiner ... Lt. Cmdr. Data
Lanei Chapman ... Ensign Sariel Rager
Ken Thorley ... Mr. Mott
Angelina Fiordellisi ... Kaminer
Scott Trost Scott Trost ... Lt. Shipley (as Scott T. Trost)
Angelo McCabe Angelo McCabe ... Crewman
John Nelson John Nelson ... Medical Technician
Majel Barrett ... Enterprise Computer (voice)


Commander Riker has not been sleeping well but Dr. Crusher can't find anything wrong with him. He is constantly exhausted and has images of objects in his mind that he can't quite place. He is not the only one with a sense of deja vu and with others, manages to piece together what has been happening. It would seem they are being taken from the ship during their sleeping hours by a race conducting experiments on them. Who they are and what they hope to achieve is unknown but everyone agrees it must be related to the inter-dimensional hole in space that is somehow being created in one of the cargo bays. Written by garykmcd

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TV-PG | See all certifications »

Did You Know?


The holodeck seen in this episode was actually a physical set constructed on the studio lot, rather than the model work normally used to show a holodeck. See more »


REM deprivation does not make a person feel tired (which is what happens to Riker here). The effects of REM deprivation are more accurately depicted in Star Trek: The Next Generation: Night Terrors. See more »


[last lines]
Captain Jean-Luc Picard: Have we any idea what came through the rupture before we were able to shut it down?
Lt. Cmdr. Data: No, sir. We were unable to track it once it left the cargo bay.
Lt. Commander Geordi La Forge: Maybe it was a probe of some kind.
Lt. Cmdr. Data: Possibly they were simply curious, explorers, like ourselves.
Commander William T. Riker: Ensign Rager and I were lucky to have escaped. Lieutenant Hagler is dead. Whoever it was that sent that thing was more than simply curious.
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Referenced in Star Trek: The Next Generation: A Fistful of Datas (1992) See more »


Star Trek: The Next Generation Main Title
Composed by Jerry Goldsmith and Alexander Courage
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User Reviews

A real rollercoaster of an episode
9 May 2021 | by bernlin2000See all my reviews

I have to say, I've never seen an episode of TNG throw so many curveballs and peculiarities before! Poor computer really had her work cut out for her (no spoilers). A strange and very mysterious episode. Reminds me of the game "Myst", trying to piece together an ancient, curious puzzle. Very solid story.

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Release Date:

17 October 1992 (USA) See more »

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Paramount Television See more »
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Aspect Ratio:

1.33 : 1
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