The Night Day is an ongoing photo and audio project directed by Keffer, documenting the nightlife since 2006.

An instant snapshot of a life without the sun, more than 15 years of reporting on people who make and remake the night in Paris and everywhere Keffer goes. The stars, the unknown, the opportunists, the organizers, the enthusiasts, the dancers, the creators. Some left, others are not even arrived yet, here is the incredible diversity of this world, this universe, that few knows.