What's happening?

Star Trek: Voyager: 4x13

Waking Moments

Stardate: 51471.3. The crew is ‘attacked’ by a species of alien that live in the human dream state. It is up to Chakotay, with extensive knowledge about the dream state, to save the ship and its crew.

Star Trek: Voyager: Season 4 Episode 13
Jan. 14, 1998