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What the hell would be the point?
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That white dot he mentioned, silly.
no, no no!!!—not a white dot
It should show a test pattern.
(Because a couple billion people under age 50 have never seen one. And why the heck did the TV stations do that, anyway?)
mrqwertyasd, I’m sure there’s some sort of Parental Control program you can get and install so your wife and/or kids can’t access the internet between 2400 and 0700 your time.
High powered tube transmitters don’t like being switched off and on. And it takes a while for a cold one to warm up. It’s easier to just leave them on all the time. And “dead air” is a bad thing, so they’d put a white balance/registration card up on an easel, aim and focus a camera on it, and leave for the night.
I think it should show test card F.
…
We could streamline things by ONLY having porn sites active during those late night/early morning times.
OP, this is kind of a sledgehammer approach to whatever offends you about middle-of-the-night internet access, isn’t it? I suggest a softer touch. Your router can probably turn the internet off (for you) on the schedule you’d like.
But before you go, be sure to check out the last page of the Internet.
Uh.no. All the fun stuff happens after 12.
Look at how well that works out for China! 
As for the OP:
Are you asking if your personal internet connection should do this or if everyone’s internet connection should do this…or, if the entire internet itself should do this? If you are talking about the first one, well, that’s personal…I schedule my kids network (both wireless and wired) to shut down at 9pm and come back up at 8am, but that’s just me. If you mean everyone’s internet connection should be, well…no. Why would that be desirable? If you mean the last one, well…that’s insane.
I’m hoping you meant the first one.
Or perhaps the parents of mrqwertyasd need it for their child?
That’s not already a a thing?!? Who knew. 
It’s nostalgia… and a longing for long lost deep sleep. I think I put this in the wrong section. But that’s sleep deprivation for you. Bring back the white dot.
Yes the whole thing. 12 o’clock, national anthem followed by a the white dot. Followed by cocoa and brandy then bed. Like here The Young Ones…What is the little white dot? https://www.youtube.com/watch?v=ZmKbj5jENbc
So we should, like, download our porn during the day and watch it at night? Sounds like a bit of a hassle.
Nope. There were still stations showing a test pattern during the wee hours in 1995, so people much younger than 50 have seen one before.
The test pattern should be an American Indian.
Who’s crying.
Or an Italian guys who LOOKS like an American Indian who is crying (he’d be an actor, so he wouldn’t really be crying…just looking like he’s crying).
What if while my Internet is on, I want to go to a site hosted somewhere where it’s nighttime?