After sleeping on my chest and wake up my heart is other race, when wake on my fund my HR is run of the mill why?


Answers:    It is because of compression on your heart by the ribcage and is specially common when the heart is enlarged. When you're standing, sitting, or lying on your back, the the whole chest cavity is competent to expand (and contract of course) because the ribs are flexibly held in the front of your chest by cartilage., while at the back they're fixed to the spine.
Clearly, if the heart is already enlarged, the effect is more pronounced.
The other posting (about lungs) also is correct and it is a factor of course,.... - and there's but a further one.!

When you sleep on a full stomach the diaphragm is full and boated, pushing upwards, adding more pressure on the chest cavity. If you're on your back, the ribcage cartilage can expand and absorb this, but not when you're lying obverse down, as I described above. Source(s): Cardiovascular Physicist.
when you lay on your chest, you don't oxygenate well because your lungs cannot fully expand, less oxygen in the blood money the heart will pump faster to get the blood circulated in order to provide the mandatory amount of oxygen to the brain.


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