Sat writing a lecture today and had a distinct sensation of 'noticing' my heart beat in my chest. Wasn't a nice feeling and after a few minutes I checked my heart rate. Timed 30seconds on the clock and counted beats at my wrist... 19. That can't be right, that's a heart rate of 38bpm. Checked again for another 30sec ... 18. That's 36 bpm!!. Checked again ...19. I think 42 was the lowest I've ever had my heat rate in the past and that was measured after lying down relaxed for a while. Fortunately I've got a Drs appointment this morning anyway, so they an check that my heart is not coming to a complete stop!