<s>[INST] i have palpatations mainley assocciated with my sleep. I have been going to a cardioligist for years, and have had many tests done to no avail. I have worn a 24 Hr halter 2 times with no results I had a spontanious lung collapse 15 years ago followed by a thoracotomy at the time to repair the damage When i am awoken by these palpitations and feel my heartbeat it is normal or perhaps slightly elevated and completley out of rythm with the palpatations . MY cardioligist has been trying for some time to figure these palpatations out Does anybody have any feeling about this Thankyou [/INST] Hello! Welcome and thank you for asking on Chat Doctor! Regarding your concern, I would explain that your symptoms could be related to a sleep disorder or sleep apnea. I recommend performing a polysomnography. It can register the brain and heart electrical activity coupled with your lung oxygenation. If sleep apnea is detected, it should be treated properly. Another possibility to take into consideration is gastroesophageal reflux. I recommend taking some antacids before sleep. If your situation is improved by an antacid or PPI (omeprazole, lansoprazole), it would be indicative of gastroesophageal reflux, which could trigger this symptomatology. You should discuss with your doctor on the above issues. Hope you will find this answer helpful! Kind regards,  </s>