Thank you for this. There's always this huge elephant in the room never addressed in these articles on sleep - particularly prior to the use of internal electri

Thank you for this. There's always this huge elephant in the room never addressed in these articles on sleep - particularly prior to the use of internal electrical lighting; the time of year. Your amount of sleep and how you sleep would change substantially based on whether there was 4 hours or 14 hours of darkness. Yet it never comes up in these catch all types of articles.