NEEECK!! It's almost essential. I need the shock of it to jolt me into wakefulness. It's like starting the ignition on a twin-engined boat. Pull head to one side (normally the right side first). Crack. Left side activated. Pull to the left. Crack. Right side is on.
On days when I'm having a lie-in, I will also often, rather peculiarly, crack my toes repeatedly before getting up.
Does your neck ever crack automatically?