From a reality that have been with us, suddenly change and turn into to a dream and vanish

From a reality that have been with us, suddenly change into a dream and vanish... Yet, still the same as usual... what's the difference? they came and they go on thier free will just like that, all that we can say is, " I'm sorry " . Like a reality that have been with us that is full with flavoure, suddendly turn into a dream and vanish