If it helps people to improve their hygiene, by placebo effect or otherwise, then that's a good thing.

However, I ask because I did try it for several months, and did not notice any effect other than the minor irritation of having to keep turning it off when I wanted to watch a film in the evening (and the constant malfunctioning of f.lux – although hopefully those issues would not be present in Night Shift).

I'm not sure I would be able to detect an improvement even if there is one though - there's too many confounding factors. So I'd like to see some evidence so I can make an informed decision.