11.   When the sun goes down, the eyes cue the gland to start pumping melatonin.

12.   The sun had gone in and it was starting to get cold.

13.   The sun went down, the sky hazed over, and it was time to go home.

14.   The sun went in, and the breeze became cold.

15.   Several coyotes began howling close by as the sun went down.

16.   We watched the sun go down.

17.   The heat lingered long after the sun had gone down.

18.   The sun had just gone down and twilight would soon give way to night.

19.   I love to see that sun go down.

20.   The sun was going down upon Presley City.