Night Lights just appear in the Episode Night Light. You can buy them in the Barg'n Mart for what looks like to be a dollar. There are lots and lots of different Night lights, that are hung on a wall.
After SpongeBob reads a very scary story he becomes scared of the dark can't sleep. In the Krusty Krab, Mr. Krabs tells him to get a Night Light if he is scared of the dark, and then he buys one. SpongeBob goes into the Barg'n Mart and buys a Night Light. But he is still scared, so he buys more that 100 and the whole House is full. Even Gary's shell has one.
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