How to comfort your girlfriend after a nightmare?

My girlfriend has really bad nightmares she read about Israel getting bombed she had a bad dream about the US getting bombed every time something bad like this happens she always has nightmares about it. She doesn't want to go back to sleep she's not a morning person either. She can't stop screaming. How can I calm her down? What should I say to her?
How to comfort your girlfriend after a nightmare?
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