MetaMed's solution, to non-24 sleep disorder in particular.
I'm pretty sure I have something similar-ish with regards to drifting sleep cycles, but it's a whole lot less resistant to sleep treatment - forget 5-6 hours, 1mg melatonin an hour before bed is fine.
This is the public group instrumental rationality diary for October 1-15.
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Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating.
Immediate past diary: September 16-30
Rationality diaries archive