Optimizing sleep and managing light exposure at the wrong times of the day/night cycle are foundational for other practices related to happiness to be effective.

“So the backdrop, where I would say the kind of landscape of your chemicals and your hormones, is powerfully controlled by not just the brightness of light but the timing of light and your exposure to light. In particular, your exposure to light to your eyes is something that you have a lot of control over.”

“And it's been proven that even these small steps, which are completely cost-free. They require just a few minutes of time, but no purchase a product or anything else can allow you to greatly adjust your neurochemistry and your hormones in the direction of better mood, better sleep, and happiness.”