Conversation: The conversation between human and AI assistant.
[|Human|] For the past 4 nights i woke up around the same time with a rapid heart beat. Ive been to the cardiologist about this. My EKG and Echo were normal.  I also wore a holter but it didnt happen that night but it did show my heart beat per minute as high as 120. The doctor says there is nothing wrong and my heart is healthy but to follow up in a month if it doesnt go away. What do you think is wrong. I am 24 yrs old, 5ft 11 in and weigh 212 lbs.
[|AI|]  Hello. Thank you for asking on Chat Doctor. I understand your concern. During sleep, there is a predominance of the parasympathetic system acting on the body. However, there is a phase - rapid eye movement phase - which is characterized by a flush of catecholamines (a Chat Doctor.  You said that you tried a 24-hour Holder rhythm monitoring. My opinion is that you have nothing to worry about. However, If you continue to be worried, I would recommend you to be put on an episode rhythm monitor, which allows you to turn the machine on right at the moment when your symptoms happen. Then you can go at your physicians office and read the EKG registered at the moment of your symptoms. I hope I was helpful. Take care.