Yeah, I would be curious to see some real studies on that as well, I suspect that having a bright screen in your face is the problematic part, and that color temperature only make a very marginal difference, if any at all.

But honestly, I use it because I like it, not for any positive effects it may have on my sleep. It just makes it more pleasant to look at screens after nightfall. Also, seeing the screen change is a very pleasant "hey, stop looking at Twitter/HN and go to bed!" reminder.