Darkness at night is as important as sunlight and bright light during the morning and daytime for mental and physical health.

“although I'd like to modify sunlight because based on some new data that just came out a couple of weeks ago I'd like to now make that second pillar not sunlight but light SL dark so we could even just think about it as light when and how much light you get but what you'll soon learn is that how much dark you get is also extremely important”