I hear you! Bedrooms should not be lit at night. Black tape and an Xacto knife works great for blocking indicator lights without being too ugly.
But I've had a couple of weird issues with the electronics in our bedroom. Our garage door indicator has a bright green light to indicate the door is closed, and just taping the LED wasn't enough, as the case was semi translucent. I lined the inside of the case with aluminum duct tape to solve that problem. Fortunately, the red LED is a separate component, so it can visibly blink when the garage door is open. It's not something we ignore.
The worst offender I've ever experienced, though, is my Harmony remote with its charging cradle. The remote itself is absolutely brilliant, and is a treat to use. But the charging cradle -- what a piece of shit. There is a large glowing blue ring in the bottom, and it illuminates the entire bedroom if the remote is not in its place. And the cradle itself is stupidly sculpted to match the remote, causing a different problem. Instead of a mechanically positive connection, the curved cradle supports the remote at precisely its center of gravity, allowing it to teeter, and every time it teeters it slips on and off the tiny charging contacts. Of course the remote helpfully signals every time it's made contact with the charging cradle by beeping loudly and backlighting the screen for a few seconds. Our little 15 pound dog scratching herself on the floor nearby will cause enough of a microtremor in the floor to get it to momentarily break contact. If anyone so much as walks near the bedroom, the remote beeps and the lights glow. I have to keep a hefty weight on the stupid remote so we can sleep.
I think it's the contrast between the usability of the remote and the stupidity of the charging cradle that makes it all the more painfully awful.