通宵 (tōng xiāo) is a noun meaning 'the whole night', used as a time adverbial to describe an activity lasting from evening to dawn. 彻夜 (chè yè) is an adverb with the same meaning but is more formal and literary. 连夜 (lián yè) adds the nuance of 'without delay' or 'for several consecutive nights', often implying urgency or continuity.