This Bible contradiction is from the Skeptic's Annotated Bible.

Verses

God never sleeps.

Psalm 121:3-4 View context

He will not suffer thy foot to be moved: he that keepeth thee will not slumber.

Behold, he that keepeth Israel shall neither slumber nor sleep.

God sometimes sleeps.

Psalm 44:23 View context

Awake, why sleepest thou, O Lord? arise, cast [us] not off for ever.