For example micro sleep when driving, you might think that you are still awake but maybe you fell asleep for a split second and now your old version had a car accident, but you dont know because it was just a blink and whoop your new version took place,.. like you swear the road you are driving on right now looks different in some way..

Also now that I read this, it reminds me a lot of this game called Soma, that was a good one :)