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Atrial fibrillation is a cardiac arrhythmia in which the upper chambers of the heart the atria beat irregularly and, often, rapidly. The condition occurs as a consequence of uncoordinated electrical ...

Atrial fibrillation (AFib) symptoms like palpitations, dizziness, sweating, and shortness of breath may occur or worsen at night. Sleep is a well-known trigger for AFib episodes. Sleep position, sleep ...