 [ Symptoms ] when lie down i hear my heart beating very loudly in my ears i have borderline high blood pressure could that be it [ Disease ] it is very common to sense your heart beat while lying in bed    rarely is it anything serious but certainly this sensation will be aggravated if your blood pressure is high if your blood pressure is normal it most likely is not a cause of concern it may also be intensified by any heightened catecholamine release for example adrenaline state such as caffeine consumption anxiety fear etc