Thanks for posting a query in health care magic.
If these episodes are occurring only at night,then they may not be panic attacks. Some cardiac conditions also present with such kind of symptoms. It depends on your age and if you have hypertension/diabetes
or any other risk factors.
You should undergo an ECG and echocardiograhy to rule out any cardiac cause.
Hope I am able to solve your concerns.
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Wish you good health.
Dr. Srikanth Reddy M.D.