Often, after taking a nap I will wake up and feel my whole torso flutter or vibrate.it is more concentrated right under my heart .sorta where my abdominal aorta is located. Sometimes, I can feel the vibration even in my hands and neck. It only lasts for about 10-40 seconds. I m not a smoker and I ve had EKG s in the past (as most recently as 1 year ago), always comes out normal. Can someone point me in the right direction or offer some advice?