Now it was as regular an affair as eating and drinking.

Each time Coupeau came home drunk, she would go to Lantier's room.

This was usually on Mondays, Tuesdays and Wednesdays.

Sometimes on other nights, if Coupeau was snoring too loudly, she would leave in the middle of the night.

It was not that she cared more for Lantier, but just that she slept better in his room.
Mother Coupeau never dared speak openly of it.