Oi! I remember it! Now shut it and I'll sing it for you and you'll fall right down into a lovely soft sleep. Ahem....

[After some initial hesitation, as though he is still reaching back in his memory for this one to a long time ago, Jack begins in that rusted voice:]

Far away, far away child
Turn your eyes far away child
I will sleep right down beside you
Tonight I will sleep tonight
Pirate ships, Pirate ships child
Merry and bold, sparkling and rich child
Coming to dock right at your feet
Tonight; coming to dock, tonight
In the stars, in the stars child
See the people in the stars child
They will sail
Right through your window
Tonight
Into your window
Tonight...

...There might be more, but I've forgotten it.