###Human: What is the reason for chest pain while sleeping? ###Assistant: Hello. Your symptoms do not seem to be related to any cardiac disorders. A lung disorder or acid reflux could be the cause of your complaints. For this reason, I recommend consulting with your attending physician and performing some tests. A chest X-ray study and pulmonary function tests, complete blood count, PCR, ESR for inflammation, a fibrogastroscopy. If all these tests result are normal, you should consider anxiety as the main cause of your complaints.