In this kind of short story, the monster can also be seen as a projection of a child's imagination. Maybe the child heard some spooky stories or watched a scary movie, and then their mind created this 'monster under the bed'. Usually, the resolution of the story is about the child facing their fear, which is an important life lesson.
One night, I was lying in bed, and suddenly I heard a strange noise. I peeked under my bed, and there was a shadowy figure. It had big, glowing eyes. I quickly pulled my blanket over my head and shivered all night, too scared to move. The next morning, it was gone, but I still wonder what it was.
It could be about a child who is constantly afraid at night because they believe there's a monster lurking under their bed. Every creak in the floorboards or shadow on the wall makes them think the monster is about to emerge.
Well, it might be about a child who is terrified every night because they think there's a monster under the bed. Maybe the child tries different things to get rid of the fear, like using a flashlight to look under the bed but never seeing anything clearly.
Once upon a time, I was lying in my bed, just about to fall asleep. Then I heard a strange scratching sound from under my bed. I peeked over the edge and saw two glowing eyes. I was so scared that I hid under the covers. But then I remembered it might be my cat. I called for my cat and sure enough, it came out from under the bed. It was just a false alarm.
Well, in many 'the monster under the bed' short stories, usually it's about a child who is afraid of a monster lurking under their bed at night. The child might hear strange noises or have an uneasy feeling that something is there. It often plays on the common childhood fear of the unknown in the dark.