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While some claim to have suffered a panic attack in their sleep, medical expert believes that it could be a nightmare or night terror. Speaking to India TV, the doctor also explains what is the difference between the two and how the situation can be managed.

India TV got in touch with a psychiatrist to know more about panic attacks and what should the patient and people around him should do to help. Here are symptoms, diagnoses and breathing exercises that can help a person suffering from a panic attack.

Panic attack symptoms. irregular heart rhythms. panic attacks. >> reporter: caffeine is a drug. the most popular drug in the world. you can feel and see the effects on the body. i downed the equivalent of about four cups. doctors took a look at my brain before caffeine. and here's after. the bloodflow dropped 40%. >> it's like a 40% drop in the blood flow to your brain. that's a lot. >> reporter: that lower blood flow is still within normal range. but those constricted vessels meant my blood pressure shot up. a cup of coffee alone won't send you to the e.r. and the most popular energy drinks h...