The Poppleton books by Cynthia Rylant.
They are SO funny and clever.
And short, so good for a bed time story .
I'd say they were perfect for reading to a child from about 3 or 4 upwards.
A 6 year old could read them to him or herself.
They are poignant and touching and witty and charming without being in the least bit sickly or earnest.
I cannot recommend highly enough.