The illusion can also be seen even if the light is not flickering, but flickering tends to intensify it. It is a very intense illusion when the visual field is mostly empty as in the case of the night sky. The illsuion is based on the microsaccadic motion of your eyes as they try to intensely fixate a small target. The microsaccades are due to normal physiological motor activity of the extraocular muscles.
Where in the sky will it be?
I am in Rancho Mirage-Palm Springs
Sounds like you are saying I have oculosis!
That is where the optic nerve... 
gets tangled with the lower colon and gives one a crappy outlook on life!
Might be, Jame T for Timber, but I must go to beddy by as I have to go in for some minor surgery (Minor my A$$ only when it is some else going under the knife!) in the morning.
Ciao!