What would happen to our sleep habits if a day was 36 hours-long instead of 24 hours?
Would we sleep twice a day or would be there one longer sleep?
How would the daily routine differ in terms of work hours, sleep periods and eating habits?
Worldbuilding Stack Exchange is a question and answer site for writers/artists using science, geography and culture to construct imaginary worlds and settings. It only takes a minute to sign up.Sign up to join this community
36 hours is not too much for humans to adapt to it. Our circadian clock responds to the ambient light. Without 24-hour days, there would be little that attaches us to this schedule, moreover, trying to establish a day circle that is different from the natural light circle would cause disorders in our bodies.
People who spend long time without sunlight (for example in caves) are developing their own cycles, typically longer than 24-hour.
See also this Wikipedia article: Non-24-hour sleep–wake disorder.