He explained: ‘When you don’t have access to the correct amount of restorative sleep at night, your blood vessels will dilate.'

Source: https://www.dailymail.co.uk/femail/article-11807639/Aesthetic-surgeon-explains-happen-face-dont-eight-hours-sleep.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

The experts revealed: "Elevated blood pressure can strain blood vessels, including those in the eyes, causing them to dilate and become more prominent.

Source: https://www.birminghammail.co.uk/news/health/everyday-eye-problems-could-sign-27763501

This relaxation causes the vessels to dilate and increase blood flow to the penis, resulting in an erection.

Source: https://303magazine.com/2023/05/larginine-dosage-for-ed_-full-guide-and-best-products/