Depression and anxiety, as well as severe mental disorders such as schizophrenia, have become more openly discussed in society. Yet, one aspect of mental health remains largely in the shadows: Nightmares.

Not just the product of children's over-active imaginations, about 5% of adults experience frequent nightmares. A study published in 2001 demonstrated that men who suffered from frequent nightmares were more likely to commit suicide than those who did not. However, the study included war veterans, a group who suffers more frequently from nightmares compared to the general population, most likely as a result of PTSD.

So, a new team of researchers wanted to separate veterans from civilians and ...