1. frightening or unpleasant dreams that occur during sleep
Usage: plural of nightmare
2. very unpleasant or frightening experiences or situations
Usage: figurative use

Examples

• She woke up screaming from recurring nightmares about the accident.
• The child had nightmares after watching the scary movie.
• Moving to a new city turned into a series of nightmares with delayed flights and lost luggage.
• Traffic jams during rush hour are absolute nightmares.
• His nightmares about failing the exam kept him awake all night.
• The wedding planning became one of her worst nightmares when everything went wrong.
• These vivid nightmares have been disturbing her sleep for weeks.