Most of you guys are describing two things:

One is blue field entroptic phenomena, the other is migraine or cluster headache symptoms.

Sometimes when your blood pressure spikes, you can have an interesting type of migraine that has weird crap like sparkly lights that whiz through your vision but does NOT produce a headache.

You guys can talk about the matrix or aether or whatever, but if you have the silver sparkly things and then you have any other symptoms such as: numbness or tingling anywhere, odd scent or taste sensations, nausea, headache, light sensitivity, sound sensitivity or hearing diminishment(sounds like you are underwater), inability to focus, nosebleeds, prickling or "skin crawling" sensations, inability to maintain balance, or any other weird crap, then go see a damn doctor.