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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.

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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.

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