Why Do Men Get Morning Erections? 5 Answers to Your Questions
https://health.clevelandclinic.org/men-get-morning-erections-5-answers-questions/ Accessed 17 October,2022
你有多久沒見早起的鳥兒了? 什麼是勃起功能障礙 ? （台北榮民總醫院）
https://guweb.vghtpe.gov.tw/disease.aspx?id=453 Accessed 17 October,2022
認識男性性功能（書田泌尿科眼科診所）
http://www.shutien.org.tw/dr_doc_detail.aspx?bookid=382 Accessed 17 October,2022
Everything You Need To Know About Morning Wood.
https://www.healthline.com/health/mens-health/morning-wood#what-if-morning-wood-ceases
What is ‘morning wood,’ and why does it happen? https://www.medicalnewstoday.com/articles/325305.php
Does No Morning Erection Mean Erectile Dysfunction?
https://www.verywellhealth.com/morning-wood-erectile-dysfunction-3015086
Causes of Morning Erections in Men.
https://www.verywellhealth.com/what-causes-morning-wood-or-morning-erections-3015089