Author Michael Rosen is “stable and alert” after spending a night in an intensive care unit, his family have said.

A statement posted to the 73-year-old’s Twitter account by his family read: “Michael is very poorly at the moment.

“Having spent a night in ICU, he is now doing ‘ok, stable, alert’ and was able to go to a ward yesterday. Thank you very much for all your kind concern. Emma x.”

It is currently unclear as to the cause of Rosen’s condition.

Rosen is a prolific children’s author whose work has been adapted for the stage and onscreen. Among his most popular books are Chocolate Cake, Quick, Let’s Get Out of Here, and We’re Going on a Bear Hunt.

Writer and journalist Shappi Khorsandi was among those sending Rosen well-wishes.

“Michael is so loved by me and my children. Cherished,” she wrote.

“Sending loads of love from me and Vivie (6, who, as I tweet, is writing stories downstairs and practising saying them out...inspired by Michael!) and Cass whose childhoods he has brought so much joy to.”