Along with melatonin and magnesium (also 1 hour before bed), this has helped my sleep quality greatly.
I wonder if the blue-light problem is the result of its contrast with warm-white 3000K illumination.
There are a lot of feedback loops in your body though, so it's entirely possible that your body produce the protein that triggers the breakdown of melatonin though.
Other theory: you bulbs are blue, but are missing the particular blue that causes meletonin to be broken down by the body.
I have 6500k 92 cri bulbs for most of my lighting and it definitely screws up my sleep cycle if I don't remember to switch to my 3000k area lighting. I have a really flexible schedule so I didn't notice how screwed up my schedule was for a while.