1. A polite expression wishing someone to rest well, typically said before sleep or during a period of rest
Before leaving for the night, she said 'que descanses' to her friend
Antes de sair à noite, ela disse 'que descanses' ao seu amigo
2. An informal goodbye or goodnight wish in Spanish-speaking contexts
He replied 'que descanses' when his colleague left work early
Ele respondeu 'que descanses' quando seu colega saiu do trabalho mais cedo