NET
12 When the sun went down, Abram fell sound asleep, and great terror overwhelmed him.
Darby
12 And as the sun was just going down, a deep sleep fell upon Abram; and behold, a horror, a great darkness, fell upon him.
KJV
12 And when the sun was going down, a deep sleep fell upon Abram; and, lo, an horror of great darkness fell upon him.