I remember there was a day last month that I was particularly busy. My husband was working late, so I had to feed, bath, and put the kids to bed by myself. I remember feeling pleased that I hadn't had any noticeable palpitations all day, especially since I was stressed and busy. Crazy thing was that once the kids were sleeping, I sat down, relaxed, started to do some fun online Christmas shopping and then BAM!, my heart started to beat fast and hard for about 5 seconds.
Such a downer to the day! It's crazy how things can sneak up on you when you think you are relaxed.