Why do i have nightmares everytime i go to sleep?

Stress/worries: Recurrent nightmares reflect stress/worries. Review your life, list your stressors, & seek solutions. Use strategies including talking with a trusted person, develop self calming skills, and eliminate unnecessary stresses. Review your internal dialogue as what we tell ourselves affects our stress/dreams. Develop a positive internal dialogue. Rewrite nightmares with positive ending-take charge.

2nd answer: Nightmares may result from various meds, medical & psychiatric illnesses in addition to stress & worry. Daily living habits may contribute, such as a late night snack, certain foods, sleep deprivation (which may be caused by nightmares). If unable to identify specific cause then general measures noted in my first answer apply. If you rewrite dreams upon awakening you can train your brain to do it.