They're cheap (at least, subsidized), they're long lasting (maybe), they're energy efficient (certainly), and they emit a huge amount of blue, squarely in the wavelengths that the human eye uses to determine if it's day or night. The practical effect is that if you're using LED lighting, it's quite hard to go to sleep at night - and we know that sleep deprivation is really bad for humans across pretty much any metric you might care to examine.
The way that white LEDs work is simple enough: They're a blue LED. Bright, efficient, and very much not anything "white." So, the package is coated with various sorts of phosphors that take some of the energy from the blue wavelengths, and move it down into the reds and yellows and greens. Presto, white light of your desired color temperature! Daylight, warm, it can be done.
Unfortunately, it's not the same spectrum as an incandescent emitter at the same color temperature - there's still a huge chunk of blue over at one end. Color temperature is just an average - you need to look at the CRI (color rendering index) to get a better feel for it, and most LEDs, while better than the utterly ugly light of compact florescent (seriously, yuck - and the spectrum shows why), still aren't great. They have a lot of blue. The cheaper ones, common in homes, have a lot of blue. Even the "red shift dimming" one still have a lot of blue when dimmed.
And this blue is right in the range that your body uses to inhibit melatonin production. There are separate receptors in the eye that pick up light in the ~440-480nm range, and go "Oh, hey, it's day - stay awake!" If you have LEDs, these are doing the same thing in the evening. And perhaps as you head to bed, if you've got LEDs.
We all broadly know that screens are bad for sleep because of the blue, but modern LED bulbs are exactly the same thing. Worse, actually, because they tend to be above us - in the "sky" field of view, which is what these detectors are optimized for.
If you have the resources to try it, try replacing some of your evening bulbs with incandescent bulbs on a dimmer, and dim them down pretty hard as you're starting to wind down and head to bed. Or use kerosene lanterns or something - you want an incandescent emitter, which, in the dimmer ranges, emits almost no blue at all. And then avoid screens entirely for a few hours before bed. See how you sleep. If it's not improved, bug me, I'll buy your bulbs from you.
Of course, cell phones and modern social media are the easy one that we're already seeing backlash to. But that's easy. LED bulbs are more subtle in their manner of being toxic to humans.