I had the Intensive care unit a little concerned when my traces showed a couple if instances of sinus pauses up to 4 secs long in the first 12 hours following open heart surgery. When my cardiologist showed me the traces two days later, I told him that I remember seeing those same traces on the monitor when I turned over in bed to look at the monitor. I wondered why the traces sort of flat lined with a very low freq. wave and then just gave up wondering and turned back to watch the soaps on TV. Since I seem to be doing fine walking the golf course every day a couple of months later I chalked it up to the leads coming lose when I turned over in bed.