It's based on environment temperature changes that influence the position of testicles in the scrotum. The scrotal muscle get contracts at low temp and come close to body, streatches and goes low in high temperatures.
I don't get what you mean by night and morning!!! Nocturnal penile tumescence (NPT) is same
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Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
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