To be clear, I was not calling bullshit - I experimented with UVEX blue-blocking glasses, and so a marked difference in "natural" sleep times. Similarly with early morning Vitamin D, and exercise, and I am not the only one.

However, I am not aware of any reasonably objective evaluation of these claims, so I don't consider them "truth" or "science" - they are anecdata, which might be interesting, but not science.