In a study published this week in Current Biology, Min and others analyzed historical data on lifespans of men in Korea. Apparently, back in the day, emperors would adopt eunuchs (men castrated before puberty) to live with and work with them. What better way to prevent the staff from sleeping with your family members? Well, it turns out, men without testes live 15 years longer, on average, than men with testes of similar socio-economic status. It seems that testosterone just isn’t that good for you. So, if you want to live longer, just cut your balls off.
Research is starting to converge on a pretty clear picture of how the brain knows to go to sleep, and the lack of light is a huge player. That means that reading on a backlit electronic display prevents you from going to sleep. It has to do with melatonin. Here’s an article summarizing the whole story, but if you’re thinking you want to be unconscious in the next hour, turn off your computer/tablet/phone/whatever and pick up a book. You can read about sleep when you wake up.