Military members that have trouble sleeping prior to deployment have a greater risk of developing mental disorders once they return home. Men and women with pre-existing insomnia symptoms may develop PTSD, depression, and anxiety – which are equal to combat exposure. Understanding the risk factors is very importance in a military setting.
The largest study has been on the military in Iraq and Afghanistan. Another finding from this study was, besides insomnia symptoms, those sleeping less than six hours per night were at the same risk. The military is still working on effective interventions to reduce subsequent morbidity from mental disorders.