When you sleep for 8 hours, the main arteries and veins of our bodies relax, and constrict a little because of the obviously decreased cardiac output. I think your heart gets smaller when you sleep. Several months ago I was really wondering and trying to imagine the look of a sleeping heart/pulmonary.sys, because for the first tme in my life i listened to my heart during a learning process about BP. Today when we were going over stethescope in Lab, and the instructor said something about the constriction of the lungs causes them to make a squeaking sound. Once you stretch in the morning, it feels good to your pulmonary.sys because it opens up. The squeak i hear of myself when I put the stethescope above my heart first thing in the morning is blood squeaking inside freshly dialated pulmonary.sys after you sleep.
Is what I am saying valid? Please steer this thread into auscultationland :-