Why do I feel a pulsing heartbeat in my eyeball when I lay down completely flat?
1. Introduction Feeling a pulsing heartbeat in the eyeball when lying completely flat is caused by a physiological shift in hemodynamics that increases venous pressure in the cranial cavity. In the supine position, gravity no longer assists venous drainage from the head, leading to mild engorgement of the choroidal vascular bed located directly behind the … Read more