According to a study by the Society for Endocrinology, it could actually be that as certain parts of the brain shut down during REM sleep, his brain is no longer keeping his penis in check. Whereas normally the brain is regulating the penis and making sure erections only occur when needed, during REM the penis is free to do whatever it wants. And what it wants to do is get hard.
http://www.cosmopolitan.com/sex-lov...boyfriend-always-waking-up-with-morning-wood/
You... just used cosmopolitan as a source?
Good YouTube video.morning wood repairs and maintains functionality
Predict estradiol, DHT, and free testosterone levels based on total testosterone
This tool provides predictions based on statistical models and should NOT replace professional medical advice. Always consult with your healthcare provider before making any changes to your TRT protocol.
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A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.
Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth, prostate health, and masculinization effects.
The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.
Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.
DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038