So what it does is it's working at mitochondrial level. So it's a place where your ATP is made. Your adenosine triphosphate. So it's increasing that.

But deep sleep, one of the primary things that's happening is you need to give your mitochondria a rest because your mitochondria are what produce all the energy that you need for producing everything in your body, for maintaining it, for repairing it, and for distributing it properly and for keeping it going across the lifespan. And so your mitochondria are going to essentially take a nap, take a rest. They don't go off because you die, but they really turn down the volume of the work they're doing. But then you take your metabolic rate way lower than that. And so you can build up the reserves of energy that you had used up the day before.

But like I was saying at the beginning, I really think that the simplest explanation for why mitochondrial function declines 1% per year and gets cut in half by age 70 is just this.

And so a lot of people think that like if their mitochondrial function is declining, they should feel tired all the time. But that's not necessarily the case. It might be that you're just losing the energy that you need to actually help the mito, you know, the mitochondrial chemical energy to help control how you use energy. And so you are wasting it as anxiety and that's coming out of productivity.