The lark and owl distinction has been driving me crazy since I thought about my sleeping habits. I spent about 2 years with completely self-determined sleep (I even collected sleep data) and do not even approximately fit into those schemes. I alternate between a lot of sleep and no sleep over the course of 10 days continually shifting my waking hours into the night until I reset. Some people claim that this would be unhealthy, but (measured by introspection) I felt good and haven't been sick during that time. And I have spoken to some people that feel similar.
While all this is not based on anything that can withstand analysis, it adds a strange flavor to advice when it starts with broad categories which seem not entirely correct.
Same here. I've been allowing myself to sleep pretty much whenever I feel like it for the past several months, and I don't appear to have any sleep pattern. Sometimes I sleep 3 or 4 hours, and wake up feeling well-rested and ready to get back to work; other times I'll sleep 12 hours at a stretch. It's irrespective of the 24-hour day. After reading your comment, I'm going to start logging my sleep, to see if there's any noticeable pattern. Thanks.
If you removed artificial lighting (including computer screens, tv, etc) from your life between sunset and sunrise, I can almost guarantee your sleep would fall into a pattern. Artificial light wrecks havoc on our automatic systems and stops our internal clocks from properly tracking time.
I highly recommend you try this for a month. Have a set time (say, 10-12PM) after which you will be able to get 8 hours of sleep and declare that blackout time: no lights, candles, tvs, computers, phones, etc. You will be amazed when within that month you aquire the ability to go to sleep and wake at the same times each day.
I have a hunch that you might be absolutely right. But it's unclear to me whether following this advice would improve my quality of life. Right now I'm productive, working whenever I can without respect to the clock. Limiting my productivity just so I can conform to an Earth day seems like it could be counterproductive.
While all this is not based on anything that can withstand analysis, it adds a strange flavor to advice when it starts with broad categories which seem not entirely correct.