My grandfather sang this song to my dad, who sang it to me, and now it is the lullaby I sing to my children before bed. We all sing it wrong though.

Here are the lyrics the Higgins clan sings:

Go to sleep my little buckaroo
Dream some dreams like grown up cowboys do So go to sleep my little buckaroo

Go to sleep my little buckaroo
And remember that your dad was once a kid like you
So go to sleep my little buckaroo.