Waking up at night with very fast pulse

I'm a male in my mid 30's  I'm moderately overweight.  I do not have sleep apnea, I was tested for that.  I was also given an echocardiogram and EKG which were normal.   No abnormalities in my blood tests.

http://usera.imagecave.com/rob4/heart%20trace.jpg

There is a scan of my heart trace.  What happens is that I will wake up after falling asleep, almost always within 2 hours of falling asleep with a badly racing heart (as you can see in the link above).  Usually I will get out of bed and start walking around when I am still mostly asleep, and my brain is confused and very scared but I am not yet aware enough to be fully conscious of what's going on (it's like a dream),  but after moments pass, I will become awake and then realize that my heart is racing very fast.  Once I wake up and am aware of this, it take about 30 seconds for my heart to completely calm down and go back to a normal rate.   This never happens when I'm awake, although I do get PVC's that come and go over periods of months.

Am I having an anxious dream, can I assume that's what it is since it only happens in the sleep and never when awake?   I was wondering what you think my risk of something serious happening to me due to this?  

Can I die from this??????????????????????

I would like to know your opinion, I know the opinion of the doctors I saw, but would like to hear yours.  Thank you very much

[CCF HeartMD6]

Although it is difficult (and impossible) to say by your scan over a computer, review of your strip seems to show that you have an underlying supraventricular tachycardia (SVT) with a rate of (what appears to be) around 150 bpm - which could represent an atrial tachycardia. Having a heart rate this fast can often times be tolerated by some (especially young people) but can also be dangerous as it can potentially lower your blood pressure. If you are having symptoms (light-headedness, fatigue, fainting), you should be evaluated by a physician sooner rather than later. However, regardless of symptoms, you should have an electrophysiologist see you where further testing can be done, such as an echocardiogram, blood work, and a careful history and physical.

[martinj419]

I should also add that this will happen many nights for a period of time (weeks to months), and then,  it will stop happening for many months, only to return again 3 months, 6 months later.