I read somewhere that childrens' reluctance to sleep was a form of separation anxiety - something that had never occurred to me, but made intuitive sense.
So now, when he's had his (at least) three stories, this is what I tell him:
If you shut your eyes tightIt seems to help - in fact he's prompted me for it a couple of times recently when I forgot.
and look very carefully
you just might see
the moon and the stars
What little spells have helped you with your children?
And did your parents have any for you?