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.
"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.
Announcing this, he wrote;
''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!''
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