I have exactly what the first poster describes. I have had it for 9 years and is nothing to do with my heart. It occurs everywhere (arms, legs, torso, head) and although it is constant, it is not in sync with my heartbeat, it is much faster. I too feel it more when lying down, which is normal as when you lie down you are usually prone and not active. You feel it more when still.
I have been misdiagnosed for the last 9 years and finally the medical profession are beginning to listen to what I have to say. I believe I have Lyme`s Disease, although a test a long time ago was negative. The effect on the nervous system and motor neuron nerve cells cause this resonating, although relatively painless in itself I have pain all over my body, wherever I have blood and muscle (i.e. less pain on my chest, as a man) I feel more resonating. I sleep poorly and stiffen up like a corpse, even if I am resting for as little as 30 minutes. I can do most things, but the moment I stop, I am done for, for the rest of that day, no matter how little or much I do. I hope my story helps someone.
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pulsing sensations throughout body.