I just noticed your username, and I have to say thank you for your detailed articles and specially for your melatonin study. It personally helped me in improving my sleeping habits when I was having a lot of stress-induced sleeping issues. Thanks again!
You're welcome. I think the melatonin suggestion is particularly valuable for HNers as we all tend to spend so many hours staring at bright white/blue lightbulbs called screens...
(I think my recently finished Redshift self-experiment will show this effect dramatically.)