Why do we see colors?

Why do i sometimes see some colors swap when i wake up?

• Its been happening for a few weeks now, and its starting to freak me out. Sometimes, when i just wake up, some black colors become green (e,g. black hair turns to green) and brown colors become really yellow. This isn't like a hallucination of some sort. The colors are vivid although it changes back to its real color after several seconds. Sometimes though, there are only some parts of an area where the color changes (not entirely the whole color (black, brown) in a shape, for example). And it only swaps when its either black (it becomes green) or brown (it becomes yellow). Other colors are fine. Im trying to google on it if other people experience it too but so far I haven't found one that experience exactly the way im seeing.

• Answer:

  that **** happens to me to!