The last few nights I've been awoken numerous times with a fast heart rate. It seems regular, just much faster than it should be (my resting PR is 59, but it is around 85-90 when I'm woken up). It seems to correct itself after 5mins-1hr. Is this Atrial Flutter? I'd be interested to know what symptoms people experience with Atrial Flutter, to see if this is similar. When in AF, my HR goes up to around 100, so an Atrial Flutter of around 85-90 would be in line with that. Thanks in advance for your replies.