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Published 15:21 29 Aug 2015 BST
Updated 16:28 12 Nov 2015 GMT

In the tale, Ehrlin features sleepy characters and a special language pattern designed to induce feelings of sleepiness in children.
As Upworthy points out, parents will lose an average of 16 nights of sleep per month in the first three years of a child's life.
The book has shot to the top of the bestseller list on Amazon, with parents clamouring to offer rave reviews.
A free e-book version is also available.