Night lights
SpongeBob buys a Night Light
Night Lights just appear in the Episode Night Light. You can buy them in the Barg'n Mart. 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 scraed 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.