If a dream is a wish your heart makes, what's a nightmare?

What you get when you eat to many sweets.

In this sentence, the dream is described as a goal or what u want. otherwise known as not the dreams u have in ur sleep. this means that nightmare isn't the bad dream u have in ur sleep. the nightmare in ur sleep is just something bad happening that wont be true ( usually ). the nightmare this question asks is the opposite of a goal.

nightmare is something you dont want to happen. something that stresses u out or makes u scared and uncomfortable. something u fear will happen or something that happens right now that u feel makes u uncomfortable.

hope this helps a bit! :)

For example. if i walk 10 feet north then go 20 feet east that would be a displacement of around 15 feet