Originally Posted by
Bcharles123
While completely anecdotal I once conducted a long term sleep experiment on myself.
I lived at the south pole for a little more than one year. A place with exactly one sunrise and one sunset per year. Clocks are arbitrary w.r.t. daytime/night time. For nine of the months, when we were down to a skeleton crew, I was able to sleep when tired and wake when not tired (no alarm clock). Our berthing areas (rooms) were private, quite and dark. With a few exceptions of time critical experiments or other events, I went to sleep on average 2hrs latter each successive night and woke, naturally after (almost) 8 hrs. This 26hr cycle was slightly asynchronous with a normal 24hr cycle. I was acutely aware of my own cycle which repeated more than 20 times in 9 months.
The lesson of this experience was, the amount of sleep required is roughly constant and the cue TO sleep drifts from the normal 24hr circadian inputs. I would weigh amount over timing.