A purple haze.
Welcome to the forum. This would make a nice monitor background.
The grain in the atmosphere can be lessened. Open the quality tab on the atmosphere and turn it up to 0.7. Run a small test render. Then turn it up some more if needed.
Turn what up on the atmosphere tab? Number of sample is already 32. Thanks. :D
Sorry, wrong tab advise... ::) Try 48 or 64 samples.
Sometimes not being able to sleep just gets confusing.