What is when day breaks?

When Day Breaks is a horror story told through prose, framing a spooky tale about how the Sun activation event affected Dr. Igotta’s life and yours. Nobody knows why the Sun can do this – it’s an anomaly, just like any other SCP.

How does the sun become SCP-001?

SCP-001 is the designation given to the Sun, after an event resulting in ~6.8 billion casualties within the first twenty-four hours. The SCP-001 effect does not seem to result from exposure to ultraviolet rays, but rather light in the visual spectrum (~390 to 700 nm). The effect is similarly present in moonlight.