Sentence:  By the time Felix turned up it was early afternoon , which , one would think , would be late enough so that by then , except for small children and a few hardy souls who had not yet sobered up , it could have been expected that people would no longer be having any sort of active interest in the previous <WSD>night</WSD> 's noisemakers and paper hats . 
Meaning of the word marked with <WSD> tags:  the time after sunset and before sunrise while it is dark outside