Hello! Welcome and thank you for asking on HCM! I read carefully your question and would explain that it is necessary to perform a careful differential diagnosis of your symptoms: -the palpitations could be related to cardiac arrhythmia. That is why it is important to examine your cardiac function. - the dreams could be related to a sleep disorder or to epileptic seizures. Do you dream with eyes opened during the day or just at night? Brain hypoxia related to cardiac arrhythmia could be the cause. I recommend consulting with your attending physician for a careful physical examination and some tests: -chest X ray study and respiratory function tests -resting ECG and cardiac ultrasound. An ambulatory 24-48 hours ECG monitoring would help examine your heart rhythm trends during the day. - blood lab tests (complete blood count, thyroid hormone levels, blood electolytes, kidney and liver function tests, blood fasting glucose, etc.) - an EEG to examine your brain function. If you experience the dreams only at night, a polysomnography would be helpful to rule out a possible sleep disorder. You should discuss with your doctor on the above issues. Hope you will find this answer helpful! Kind regards! Dr. Iliri