[notacoward]

That might be possible with good blackout curtains, except for the LEDs on damn near everything. Even in my own room at home, I have to remember to cover the USB charger that I use for laptop and random other devices. When I travel, it's a nightmare - clock radios, TVs, microwaves, and especially the lights built in to many GFCI outlets in bathrooms. I used to bring a roll of electrical tape for exactly this reason. Masks are the solution that works everywhere to block light, though they're less than ideal in other ways.

[Nomentatus]

Someone needs to sue any manufacturer that uses blue leds on anything that might have to be on at night.

[notacoward]

Absolutely agree. If I recall, there used to be an actual standard regarding this, but it was (is?) widely ignored and never enforced. I remember the time before blue LEDs with quite some fondness.

[golem14]

Lithographers tape works pretty well to dull LEDs just enough to no longer be offensive