If you're supplementing VitD, and you should be, taking it late in the day can give an energy boost apparently. Like as if you sat under a bright blue light late at night. It could mess with your circadian rhythm.

Seems to make sense on a broscience level. Think I read this in one of the many articles recently connecting VitD deficiency and covid.

A blue light blocker on your screens in the evening is usually recommended to avoid sleep disturbance also.