Question

If you look you cannot see me and if you see me you cannot see anything else . I can make anything you want happen , but later everything goes back to normal . what am I

Answer 1

light is the ri8 answer

Answer 2

Mmmm...
I guess its a dream or imagination...

Or it can b eyelid also....

If u look u can't see me ( eyelids r open)
If u see me u cannot see anything else (eyelids are closed)
I can make anything u want open (eyelids flickering to lucid dreams)
Everything goes back to normal (I guess I don't have to say this)

I guess the 2nd one is more accurate...