I was diagnosed with lone PAF back in 2012. Since then I've averages 2 or 3 episodes a year all lasting no more than 18 hours, some quite a bit shorter.
However, I've had the odd night when I've gone to bed and had 'that feeling'. I've done my deep breathing and my pulse has remained steady, but I've still just not felt totally right. The feeling has either passed within an hour or I go to sleep and then awake feeling fine. The fact my pulse remained steady made me think I'd held of an episode of AFib, but I'm now starting to wonder whether I'd experienced an episode of atrial flutter instead. I've recently acquired a fitbit watch that shows your heartbeat, and when I'm relaxed in bed mine is low 50s to high 40s. Do my suspicions seem possible and is a way to test it next time it happens to see if my pulse increases a lot, even though it is steady? I've never put flutter on the menu, but now I'm starting to wonder.