Facebook's Mark Zuckerberg builds his wife a glowing 'sleep box'

The "sleep box", which Facebook founder Mark Zuckerberg built for his wife, emits a very faint light between 6am and 7am, but does not tell the time to avoid stressing her out.
The "sleep box", which Facebook founder Mark Zuckerberg built for his wife, emits a very faint light between 6am and 7am, but does not tell the time to avoid stressing her out.PHOTO: MARK ZUCKERBERG/INSTAGRAM

NEW YORK (BLOOMBERG) - Facebook's Mark Zuckerberg said he built a glowing wooden box to help his wife Priscilla sleep better through the night without having to check her phone to see if it's time to look over their children.

The "sleep box" emits a very faint light between 6am and 7am - when their daughters are expected to wake up.

It doesn't show the time, as that would stress her and disrupt her sleep, the Facebook chief executive officer said in an Instagram post on Saturday (April 27).

"So far this has worked better than I expected and she can now sleep through the night," Mr Zuckerberg said, adding that the device is already popular with his friends.

"I'm putting this out there in case another entrepreneur wants to run with this and build sleep boxes for more people!"

Not everyone was impressed.

British singer Lily Allen took a jab at Facebook's effectiveness in curbing racist content, asking if there was an algorithm to make white supremacy go away.

Being a mom is hard, and since we've had kids Priscilla has had a hard time sleeping through the night. She'll wake up and check the time on her phone to see if the kids might wake up soon, but then knowing the time stresses her out and she can't fall back asleep. So I worked on building her what I call the "sleep box". It sits on her nightstand, and between the hours of 6-7am it emits a very faint light -- visible enough that if she sees it she'll know it's an okay time for one of us to get the kids, but faint enough that the light won't wake her up if she's still sleeping. And since it doesn't show the time, if she wakes up in the middle of the night, she knows to just go back to sleep without having to worry about what time it is. So far this has worked better than I expected and she can now sleep through the night. As an engineer, building a device to help my partner sleep better is one of the best ways I can think of to express my love and gratitude. A bunch of my friends have told me they'd want something like this, so I'm putting this out there in case another entrepreneur wants to run with this and build sleep boxes for more people!

Last month, Facebook announced plans to ban content that references white nationalism and white separatism, taking a major step toward curbing racism and hate speech on the site.

The problem of white nationalism was magnified in March when the killer responsible for the deaths of 50 people in New Zealand posted a racist manifesto online and used the Facebook platform to stream the massacre at two mosques live.