The sales momentum for The Rabbit Who Wants to Fall Asleep continued last week, as the self-published book sold about 35,000 copies in outlets that report to Nielsen BookScan, a 20% increase over the week that ended August 23.

Wednesday, Random House confirmed that it bought world English rights to the picture book by Carl-Johan Forssen Ehrlin (who released the title through Amazon’s CreateSpace platform). Sales of Rabbit exploded in the week ended August 23, when units sold topped 29,000, up from 24 copies in the prior week.

Sales in the U.S. were all made through BookScan’s retail & club channel, which includes Amazon and all bookstores; no sales were reported in the mass merchandisers channel that includes big box retailers, such as Walmart. When Random House releases its edition of Rabbit in October, Walmart and other clubs will certainly help to boost sales of the title.

Rabbit was selling pretty evenly across the country, with retailers that report to BookScan in the Pacific and South Atlantic regions showing the strongest sales.