Sometimes when I wake up from a nightmare
I feel on my chest (without touching) some sort of flutter about 150bpm but if I check my pulse on the neck or wrist it is normal around 60.
(I do have WPW and small prolapses, but this does not seem like it for me)
From the information you give it sounds to me like your nightmare (hope this is a rare experience - or it may need attention on its own) causes some atrial flutter. If the flutter signal don't make it through the sinus node (hope I got the part correctly named) the ventricle will not be triggered into a high rate, thus the normal (I assume) 60 bpm.
Given your known heart conditions I also conclude you have been examined by a doctor, perhaps a cardiologist. If the (guessed?) 150 bpm reoccurs you should discuss with your doctor.
I do not have any personal experience with what you describe - other than I have what I call "troublemares" most nights, and these do not cause any heart "flutter" feelings. A truly threatening/scary nightmare likely would.
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