Last week nearly 30 children from across the city brought their soft toys (not the favourite ones!) to the Edinburgh International Book Festival.
They enjoyed stories and songs in the cosy Imagination Lab after that the toys were tucked in for a sleepover.
As their carers were away for the night, the soft toys decided to stay up late and explore the book festival venue.
What did they get up to during the night? Look through the full range of pictures on Flickr to find out!