After getting accustomed over the years to the pounding pulse I often get just after lying down in bed (not sure if there is also tachycardia, but I think there is sometimes), I finally noticed last night that I only got it when lying on my left side. Of course this may be an idiosyncratic issue that only happened last night, but I had a fairly bad night, having to visit the loo numerous times, so made a point of observing what happened each time I got back into bed, and it was consistent. Lie down on left side: heart starts pounding; lie down on right side: no pounding. Anyone else noticed this? It would be good if it is consistent, as it provides a way to avoid this annoying, distracting symptom!