What can I do when every night I have nightmares?

Needs evaluation. Persistent nightmares although uncommon in adults need to be evaluated and treated. Psychological causes are underlying anxiety, depression and ptsd. Treatment; talk therapy like cbt. Medical causes; sleep apnea, restless leg syndrome or other parasomnias. Treatment; treat the disorder. Medications like benzodiazepines, ssris, anti hypertensives can cause nightmares as side effect see your doc.