Yes - I'll sleep-in for up to 12 hours, sometimes more - which then means I won't feel tired until ~6am the following morning - or later, and then I end-up with a strange 36-hour body-clock in my head while my body feels bad.

> do yo need to be awake at such early hours or do you just not want to spend more time sleeping than you currently do?

With my current job I don't need to be up at a certain time, but I actually feel sad and it lowers my self-esteem if I sleep through daylight hours - and on the times when I miraculously do wake-up naturally at sunrise I feel a kind of satisfaction with myself.

Even so, I'm still not actually all-that productive in the mornings until the afternoon (which makes it a good time for meetings!), but I'd rather be slightly less productive than feel sad and depressed.

I can get myself to 24-hour rhythm with melatonin, which I do, but it doesn't reduce amount of sleep I need so I'm left with a shortened day.

Unfortunately, after getting used to waking up without alarm, I find getting up forcefully really painful. And I doubt it would help productivity much, because I'd be half-zombie if I do it more than 2 days in a row.