What is the reality? Reality is matter and physics, " what you see what you feel is all part of the reality, feel smell etc...". Reality is relevant, it is how you interpret all what's around you, you can be in one reality but actually live in another, "imagination".
How do you measure time? Time has no beginning and has no end it is a loop.
Is there is "now" as definition? It is just a prefix to a better navigation, since we always leaving the past and entering the future, constantly.