It this occurs only in the morning when you wake up and clears quickly say within a minute or two and that's the only thing you've notice its not likely a problem. There are many discussions here about people seeing colors or spots immediately upon awakening and going awake quickly. There was a great explanation posted recently and it has to do with the varous color receptos of the retina not being "equilibrated" after the eye lide is shut during sleep
JCH MD