jcem.endojournals.org/cgi/conten … /80/6/1934
“Thus, finasteride did not consistently suppress sleep-related erections compared to placebo”
sciencedirect.com/science?_o … 26b21b0fca
" These results indicate that, whereas androgen reduction adversely affects sleep-related erections, it does not eliminate them over a 12-week trial in healthy young adult men. Further study in a larger sample is needed. Nonetheless, these preliminary findings support androgen having an important role in sleep-related erections."
springerlink.com/content/rk463974x17ltv86/
“The mean of all hormonal determinations for the five subjects did not show significant differences in plasma LH and testosterone between fully and partially tumescent episodes and nontumescent periods”
Basically it’s not as simple as more free T = more morning wood. REM sleep plays a role, and serotonin would increase that, which is what I experienced. I don’t think it increased my T however, as serotonin would decrease it if anything. It’s a combination of REM and T that seems to cause the erection, and my T hasn’t changed (well as much as I can feel) but my REM definitely increased.