Sunflowers AND moonflowers

We have both sunflowers and moonflowers blooming out front.  The sunflowers bloom night and day; the moonflowers bloom at night and close in the early morning.  All our "volunteers."  That is, we didn't plant them.  We did throw bird seed out front last year.  We think the sunflowers are from the "reprocessed" bird seed.  They're in front yards up and down the street, so we can see where the birds flew and roosted after eating from our front yard.