What is sunlighting?

A take-off from moonlighting - which means taking up a second job in the evening - sunlighting means taking time off from one’s day job to fit in other work and be paid for it. Sunlighting has a slightly adverse meaning: a person takes up a second job, and it begins interfering with the first job. Sometimes, moonlighting stretches into the day, and turns into sunlighting.

Moonlighting, Sunlighting, second job, Taking up a second job in the evening