Nightwatcher worms, also known as Arconan night terrors and sandborers, were a little-documented species of nocturnal sand-boring worms native to the planet Jakku. Mature specimens topped 20 meters in length, although some were reputed to be much larger. According to the scavengers of Jakku, nightwatchers remained under the sands motionless, but at the slightest vibration from something moving on the surface, they sprung up out of the sand and snapped onto their preys. With their triangular heads featuring large red eyes, nightwatchers bore a passing resemblance to the Arcona, a sentient species with a humanoid body. They could eat anything, since their mouthparts could grind metal into scrap, and their stomachs generated acid to melt down anything they could not digest.