If only it was impossible. Blue leds are abominable! [EDIT] I hate white ones too so the replies aren't exactly selling them!
But blue LEDs are what make white LEDs work, and those have revolutionised ordinary lighting in a big way. The linked video goes into this at the end.
Blue LEDs (or white LEDs, or blue OLEDs) are also used in modern, high quality computer and phone displays.
exec: I'm sick of that red indicator light?
minion: They just came out with a blue LED we can try.
exec: Perfect. Use it on everything. Our products will look different, and people will like it
We only associate warm orangey-white light with nocturnal lighting because of centuries of sitting around fires and candles.
Co-evolving to be comfortable with a certain quality of light, is a good argument for maintaining that quality of light, and for not using light with a quality which triggers subconscious (or conscious) discomfort.
I was at college at the time and you could read a book by the pulsating sleep blue lights from equipment.
My Vizio TV which has a piece of white electrical tape[0] with aluminum foil underneath. Incredible failure of engineering that has a setting to disable the power LED, however, that setting is ignored if you use the "black screen" option that kills the screen while the TV continues playing ... a feature you are likely to only use if you like to sleep to the noise, but not the light, of the television.
My switch has a sock wrapped around the front with a piece of cardboard jammed in it to keep the blinken-lights from creating strobe effects all night.
My monitor, multi-USB charger, have similar black-tape treatments that the TV received and the power outlet next to my dresser has a piece of white tape on it -- it's a smart plug and I'm guessing there was an indicator light under that.
The thrown together solutions indicate the worst part. You tend to not discover it's a problem until you wake up at 2:00 AM and you can't get back to sleep because it's bright as early morning in the bedroom.
[0] It was all I had at the time.
This is an example of the reaction to any new technology -- electric cars catch fire and we suddenly forget we drive around in vehicles carrying large quantities of explosive gas (and work via controlled explosions). They get stuck in the winter and we forget the few times a winter we had to jump our gas car to get somewhere. I remember actual indicator lamps ... granted, they tended to serve very temporary lighting purposes and despite that were still often burned out (if your elevator in the 80s had floor indicator lamps, 25% or more were dead).
When it's good new technology, as the blue LED objectively is, it becomes mass produced and then mass adopted as "the cool new thing." And it was the cool new thing -- I remember thinking how neat the deep blue LED on my first AV receiver was. And then it becomes over-adopted. Most of the LEDs I have covered up in my bedroom aren't blue -- they're cool white[0] and oh so much brighter than the various-shades-of-blue ones that adorn other equipment throughout my electronics stuffed house.
[0] If they were warm white, but dim, I'd probably have a similar "that's neat" if they looked like earlier indicator lamps (but cleaner).