My sleep schedule tended to drift further into the night as well. I installed f.lux s little over a week ago, and just realized a day ago that I find myself going to bed around midnight consistently! The amount of sleep has also decreased, to about 7.5 hours. sleep quality seems similar. (I'm using ElectricSleep for tracking movement)

Capitalizing on this, I've ordered orange-tinted blue-blocking glasses, and have attempted to find something like f.lux for Android. There are custom ROMs that can do it, and there's apps like Lux that only change brightness. Supposedly you can use Chainfire3D + Chainfire3D Pro + CF.Lumen, although I think that modifies your ROM.

I'm using EasyEyez right now, which can put an ugly red overlay over the screen. I don't know how effective it is, but at least you'll need to reduce blue to go from a white colour to a red colour.

YMMV, my girlfriend didn't notice any change since using f.lux.

Blue light seems to reduce the amount of melatonin in the brain, so dimmed incandescent lights are better than fluorescents or LEDs.

Red LEDs obviously wouldn't fit the deprecated category. If my understanding is correct they are also good for providing illumination in situations where it is critical that you do not lose your night vision.

Programs like F.lux or Redshift can change the color temperature of your screen at night.

I have found F.lux useful and surprisingly unintrusive. Without playing conscious attention or turning it on and off to verify the difference is not noticeable. If you do go and turn it off after adapting to the altered display it actually feels unnaturally glaring.