“Little Boy Bule” has a similar theme and origin as "Little Bo Peep" - shepherds who lost their sheep because they fell asleep. https://allnurseryrhymes.com/little-bo-peep/
But unlike like the sleepy shepherds, the Great Shepherd of the sheep neither slumbers nor sleeps.
Psalm 121:4 See also, John 10:14 (Jesus, the Good Shepherd)
