¡°We are ghosts on the night shift,¡± said Leandro Cristovao from Angola, who has worked the graveyard shift at a south London market for seven years.

In the last decade, Britain¡¯s 9 million-strong nighttime workforce has become increasingly reliant on migrants like Cristovao as the number of U.K.-born workers doing night work shrinks.

¡°You have a lot of night work carried out by migrant night workers in ¡ª somewhat unfairly named ¡ª low-skilled sectors,¡± said Julius-Cezar Macarie, a sociology professor at University College Cork.