noun
nighttime face powder; cosmetics applied before bed
Refers to powder or light makeup worn overnight, often to look presentable while sleeping or upon waking. Cross-referenced with 寝化粧, which is a related concept.
See also: 寝化粧
昔の女性は寝白粉をつけて休んだそうだ。
I hear that women in the past used to apply nighttime face powder before going to bed.
旅館の女将は寝白粉を欠かさないという。
They say the inn's proprietress never skips her nighttime powder.