宵 siu¹ {xiāo}

night

宵禁 siu¹ gam³ {xiāo jìn}

night curfew

宵夜 siu¹ je⁶ {xiāo yè}

1. midnight snack
2. late-night snack

宵征 siu¹ zing¹ {xiāo zhēng}

1. night journey
2. punitive expedition by night

宵衣旰食 siu¹ ji¹ gon³ sik⁶ {xiāo yī gàn shí}

1. to dress before light and not eat before dark (idiom)
2. diligently attending to official matters