Have you ever looked up at the sky at night and seen something that scared you, like a giant bird or a monster? Well, sometimes our brains can imagine scary things even when they're not really there - this is called a nightmare.
In the sky, there are no actual monsters or scary creatures, but our brains can sometimes see things that look like them. This can happen because of things like clouds, shadows, or even just our imagination.
For example, if you see a cloud that looks like a dragon, your brain might imagine that the dragon is real and get scared. But really, it's just a cloud that looks like a dragon.
Even though these "nightmares in the sky" aren't real, it's important to remember that it's okay to be scared sometimes. You can talk to someone you trust, like a parent or a teacher, and they can help you feel better. And remember, just because you see something scary, it doesn't mean it's actually there to harm you.