One of the interesting things to me is how long this has been a part of American history. In the excellent history podcast Backstory, one episode covers time and sleep. [1] I had known that before the electric light, most people spent time awake in the middle of the night, sleeping in two sessions ("first sleep" and "second sleep") of a few hours each.
But what I hadn't known is that part of what drove the change to one-shot sleep was moralizing busybodies in the 1800s, known as the "Early Rising" movement, who thought it was slothful to get that second tranche of sleep. They were sort of like the temperance movement.
[1] https://www.backstoryradio.org/shows/on-the-clock-4/ and in particular the "'Til Morning is Nigh" segment with historian Roger Ekirch.