It has been known for a long time that men and women dream and have nightmares but Psychologists now say they have very different dreams and nightmares. A study done at the University of Montreal says men dream more about natural and environmental disasters and war, women dream more about relationship conflicts.

 The difference between a bad dream and a nightmare is that nightmares where rarer but more emotionally intense. People who have frequent nightmares find it hard to go to sleep and those that have a nightmare while sleeping find it harder to fall back to sleep.