Prisoners of Sleep

While investigating a strange electrified spiked metal pod, Superman and Batman unwittingly unleash the cloud-like prisinor inside, (named sleep) and are then trapped in a dream world. They have nightmares. Superman dreams that everything he touches turns to kryptonite. Wonder woman tries to save them by wrapping her golden lasso around her waist and entering the dream world. She instructs a minor to wake her in five minutes by tugging on the lasso. It works. Superman then breathes the creature into his lungs and blows him back into the pod.

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S07E17 - An Unexpected Treasure