Thank you for asking the question.
Feeling of skinking rapid heart rate, that occurs at night after that rapid heart rate there is small compensatory gap where you do not feel any pulse, most of the times this is a harmless, benign condition, that resolves with exercising and in most of the causes is related to stress and inadequate sleep. but if this condition continues and exercising and changing the behaviour do not solve the problem then test like ECG, 24 hours Holter monitoring and echocardiography may help to diagnose the underlying condition or guide about further tests.
Regards
Dr. Adil Ramzan