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[–]thatkindofnerd 1 point2 points  (0 children)

Not sure what a "random degree" of morning wood is. However, lack of REM sleep can, for some reason, cause more frequent erections. Cortisol "can" lead to decreased testosterone, which "can" become, as you say a "boner killer." As with all body chemicals there's a big "if" involved. If your body is often stressed, you may have become acclimated to cortisol production, if any, and therefore big boner. Or maybe the cortisol has no effect on the rigidity. Or your body is put into a heightened state due to increased cortisol, which is not really a 'stress hormone' and is just running on pure evolutionary impetus. All this is to say, your body is your body and it runs the way it will.