Workplace bullying leads to insomnia, even for those co-workers who merely observe the harassment. In a study conducted of middle aged persons in France, men and women who suffered some harassment at work were twice as likely to suffer sleeping problems. For the study, they defined bullying as hostile actions designed to offend or oppress over a long period of time. Men who simply observed bullying were 60% likely to suffer trouble sleeping, also. Women who observed bullying were 20% more likely to also suffer some insomnia. The study was conducted by University College of Dublin, Ireland researchers.