Your body glows in the dark

Your body emits visible light continuously. It isn't a metaphor: you literally glow in the dark. The catch is that this glow is around a thousand times fainter than the human eye can detect.

A Japanese team proved it with ultrasensitive cameras able to count photons one by one. They found that the body gives off a very faint light, tied to the chemical reactions of metabolism, and that its intensity shifts over the course of the day: greater in the afternoon, lower in the small hours.

This light has nothing to do with the heat we give off. It is a real glow, though so faint that only a machine in complete darkness can see it.

Source: PLOS ONE