Hi, I'm a 38 yo female in decent shape, pretty healthy. Caffeine intake is limited to 1-2 cups of coffee a day. I haven't had soft drink in 4 years. Noticed my heart rate at rest is mid 50's to mid 60's. When I have arrhythmias, sometimes HR jumps to over 150 and sometimes it drops to 30-40, a few times it went to mid 20's. I've had a cardiac workup and just normal arrhythmias but my concern is there a drop that's too low or a spike that's too high? Normally, I don't feel anything but sometimes when the dip is significant, like from 115 to 40, I will feel nauseated or light headed. I'm concerned if I'm sleeping and my heart rate is in the 50's and I have an arrhythmia that drops it below 20. Cause for concern or not? Thanks for any input.