Nightmare – A frightening or unpleasant dream.
Ever have that dream where you’re being suffocated? It’s a common one, and it actually gave us the term nightmare. A ‘mare’ was another term for a ‘goblin’, particularly one who spent their time suffocating sleepers.
The ‘mare’ part comes from the Proto-Germanic word ‘maron’ and originally from the Proto-Indo-European word ‘mora’ which also meant a suffocating goblin – dreams of suffocation are nothing new.