The lower T claim sounds like a pretty obvious adaptation to me. High T = high risk appetite. Low T = low risk appetite. If you have kids, your risk appetite

The lower T claim sounds like a pretty obvious adaptation to me. High T = high risk appetite. Low T = low risk appetite. If you have kids, your risk appetite should be relatively lower. Otherwise your offspring may have to grow up without you around. Although I agree that the lack of sleep would have a huge impact as well.