Another variant from Solomon, Honey in the Rock: The Ruby Pickens Tartt Collection of Religious Folk Songs from Sumter County, Alabama (p. 17; words only):

I HEARD THE ANGELS SINGING

1
One day 'bout noon
One day 'bout noon
One day 'bout noon
I heard the angels singing.

2
Heaven's in my view
Heaven's in my view
Heaven's in my view
I heard the angels singing.

3
Just above my head
Just above my head
Just above my head
I heard the angels singing.

4
All in my room
All in my room
All in my room
I heard the angels singing.

One more variant is recorded in Byron Arnold, Folk Songs of Alabama (1950, p. 160), which I don't see.

~Masato