last night; the previous night
night before (Christmas, etc.); eve (of festival, major event, etc.)
前夜の雨で道がぬかるんでいた。
The road was muddy from the previous night's rain.
試合の前夜は緊張で眠れなかった。
The night before the match, I was too nervous to sleep.
出発の前夜、仲間たちと最後の食事を囲んで別れを惜しんだ。
The night before our departure, we shared a final meal with friends and said our goodbyes.