I am a huge fan of audio books . Whilst the importance of reading cannot be overemphasised, listening to an audio book can have some similar benefits. Your child will be hearing new ideas, literary structures and vocabulary. The book may expand their knowledge or pique their interest in a subject. My son also used audio books to help him sleep at night; listening to a well loved story helped stop his mind from following other thoughts and he would drift off while a familiar voice created a low background of sound.
Audible is a great site. You can download a single book or take out a monthly membership.
You may also like to look at Listening Books, a charity which provides audio books for people who find it difficult to read for a number of reasons including dyslexia. The books can be provided on CD or downloaded.