According to co-producer Phil Chapman, the recording sessions for the album took place in a studio whose air conditioning/heating vents were directly above the mixing console. Air from the vents blew directly into the faces of the control room personnel, so they often wore sunglasses to protect their eyes. Hart, working on a new song, began to improvise lyrics that included the line “I wear my sunglasses at night.”
https://en.wikipedia.org/wiki/Sunglasses_at_Night
According to co-producer Phil Chapman, the recording sessions for the album took place in a studio whose air conditioning/heating vents were directly above the mixing console. Air from the vents blew directly into the faces of the control room personnel, so they often wore sunglasses to protect their eyes. Hart, working on a new song, began to improvise lyrics that included the line “I wear my sunglasses at night.”