Both sources I have so far discussed cite the book At Day's Close: Night in Times Past by A. Roger Ekirch. I decided to go straight to the source, and today I have a short response to the Preface and Introduction of the book.
Ekirch writes excellently. He has a wonderfully pleasing flow to his writing, and he loooves epigraphs.
The Preface does little else but set up the rest of the book, which is in 4 parts, with several chapters per part. In it, Ekirch tells us the myriad reasons people "shut-in" at night. You think we're violent now? Heh. Not even close. People had a lot of very real night fears pre-industrialization. Ekirch also briefly talks about electric lighting, and the change of social life along with it.
I will next be reading Part 4, which is specifically about sleep, so look for that. Suffice it to say though, that if you're curious about pre-industrial nightlife, pick this up.