I thought I had been sleeping too long so I asked a friend living nearby. Same phenomenon.
It quickly returned back to normal within a few minutes.
What happened?
You noticed it.
A non trivial number of sundowns are spectacular.
We just aren't in the habit of noticing.
Even less in the habit for sunups.
But the light show happens twice a day.
Good luck.
Polution.
the light you saw was probably lensed / prism split by a cloud way off to the west, you happened to catch the light show in those few moments it slid over your portion of the planet.