"I'm really too young to go out into the world alone," he thought as he lay down

I'm really too young to go out into the world alone," he thought as he lay down.
I'm really too young to go out into the world alone," he thought as he lay down.
I'm really too young to go out into the world alone," he thought as he lay down.
I'm really too young to go out into the world alone," he thought as he lay down.