Sentence:  There was also hairdressing: hairdressing, too, really was hairdressing in those times — no running a comb through it and that was that. It was curled, frizzed, waved, put in curlers <WSD>overnight</WSD>, waved with hot tongs;nb.... 
Meaning of the word marked with <WSD> tags:  During or throughout the (night), especially during the evening or night just past.