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A bit off-topic, but this has puzzled me for awhile: there are times when at night I will suddenly feel like my heart is beating ridiculously quickly and loudly. It subsides with deep slow breaths. The strange thing is that I've tried putting my hand over my heart during these episodes and physically it does not feel that my heart is beating abnormally. Any ideas what's happening?

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Heart palpitations? I had a similar feeling when I got up in the night to urinate. I used a pulse oximeter to reassure myself that its okay and eventually over the weeks it stopped happening. I think there a lot of common causes as listed in the link below.

https://www.mayoclinic.org/diseases-conditions/heart-palpita...

thanks, didn't know what to search. striking to me that it seems to be all mental. I suppose it's reassuring that this is somewhat common

While sleeping? This is one of the signs of sleep apnea.

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