harmful effects of staying up late

Night Owls and the Risk of Stroke: Why Does Staying Up Late Harm Your Heart?
staying up late increases the risk of stroke and cardiovascular disease by 16%. much of this risk stems from smoking, eating late at night, and lack of sleep. people who stay up late need to proactively change their lifestyles to protect their hearts.
Gamers who are good at night will cause physiological harm
the sperm of men who slept before 22:30 was four times healthier than those who slept after 23:30. those who go to bed early have 2.75 times healthier sperm than those who sleep from 22:00 to 22:30.