My heart used to beat really fast for no reason when i used to sleep, this was a either a year ago i think. It used to be like only 4 times. It went away but than it started to beat really fast for no reason. I know it s not anxiety because i would sit on my computer and it would beat fast for a few seconds than go away, it happens pretty often but i didn t think it was a big deal. I want to know what s the cause for it, im only 15 years old, and i don t think i have high blood pressure because my doctor never mentioned i did and yeah. Is this a temporary thing ? I really want to know, is it a big deal? Please help ! I ve heard people get it having attacks for about 5 minutes, am i going to be like that? HELP please!