WASHINGTON – To sleep, perchance to dream.

That is, about monsters, wars, fires, break-ups and broken hearts. Ten thousand dreams were documented by researchers at the University of Montreal for a study into nightmares and bad dreams, reports The Daily Mail.

So what makes people cry out in fear at night?

For men the most prevalent dream was one of aggression, focusing on disasters such as earthquakes and wars. Oh and, for some reason, insects.

Women’s dreams were centered on interpersonal conflicts. Those included people lying to them, being left for another or abandoned.

For the study, researchers Antonio Zadra and Genevi