"You can’t hack what you don’t track — start with darkness." – @DaveAspreyBPR

Now, you can hack it because you can track it. You cannot hack what you can't track. And that's one thing. And if you're saying, I don't want to do that, that's too much work. One of the cheapest biohacks of all that improves leadership and performance and longevity in aging is darkness. What I'm talking about is, get yourself some blackout curtains and put tape over every single source of any light in your bedroom. And if you have to put a towel under the door, no light at all. Sleep in a cave. And people say, oh, but you know, that doesn't really matter. No, it matters far more than you might imagine, because your body is desperately trying to figure out, what time is it? Because if it's nighttime, I should be recovering. And if you look at the last 2 billion years, there was never any bright light at night except for firelight and maybe lightning. That was it. So now you turn on your bathroom lights or you have a little blue or green or yellow or white LED in the bedroom. The cells in your body are going, there's light. It must be daytime. And then it doesn't do what it's supposed to.