midday sun which contains its bright light but you see it as white light contains all of those wavelengths at equal intensity so the middle of the day is the so-called circadian Dead Zone in the middle of the day bright light triggers the activation of the of the other opson the melanopsin which increases mood increases feelings of well-being has some other consequences but you can't shift your circadian clock by viewing the sun in the middle of the day because it's in the Circadian Dead Zone