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This video of a baby sleep-laughing will make your Friday

Careful, the giggles are contagious

But — fun fact — it's totally normal for newborns to laugh in their sleep. A 2004 study found that infants as young as 17 days were having the giggles during nap time. The real mystery, however, is what a 17-day-old baby could possibly find funny given its limited understanding of the world. Science, your move.

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