Are you worried about something? I sometimes will find this happening if I am worried about something.
Or, you may want to talk to your doc about this as I have also had to be put on heart meds because of it.
I don't want to worry you as this may not be your problem but I also don't want you to put it off as something that will go away or put up with it.
There is a reason this is happening and you need to find out why.
Wishing you the best,
Linda