Morning bright light exposure increases morning cortisol levels by 50%, enhancing alertness and reducing infection susceptibility.

“And then, of course, that sunlight that you're getting is going to further enhance that healthy release of cortisol. That cortisol will then provide fuel, if you will, for that increase in temperature.”

“viewing sunlight early in the day increases it by at least 50% then you want it to taper off”

“bright light exposure in the morning especially from sunlight but um if one doesn't have access to sunlight for whatever reason there are commercially available so-called sad lamps Seasonal effective disorder lamps they range anywhere from 5,000 to 10,000 Lux very bright but um but certainly uh morning sunlight viewing and lamps of the sort I just described have been shown to increase the amplitude of the morning cortisol Spike by as much as 50%”

“Bright Lights increases the amount of cortisol with your morning cortisol pulse by 50% which is great keeps you less susceptible to infection all day”