There’s no question that being on your device late at night is a contributing factor, but there is sound science in this. UV light suppresses melatonin, which regulates the circadian rhythm. Because blue light is closer to UV on the spectrum, exposure to bright blue light in a dark environment will again suppress the melatonin, confusing the cycle, making it harder to go to sleep, and longer until you hit the deeper stages of sleep - in summary, a worse nights sleep.I would have thought the last thing a TV needs is "low blue light". When my phone goes into "nighttime" mode, the screen gets a decidedly muddy look to it. Not that I notiuced after a bit, but then, its a phone, not something I watch movies on.
Besides, its beginning to look like blue light itself isn't a problem - its a) staying up until 2am staring at your phone screen that's keeping you awake, not the fault of blue light, b) daylight has UV in it that harms you, not the blue bits in it! So ... "meh".